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    unreliable (adj.) — unsupervised (adj.)

    unreliable (adj.)

    1835 (Fanny Kemble), from un- (1) "not" + reliable (adj.).ETD unreliable (adj.).2

    unrelieved (adj.)

    "monotonous, unvarying," 1764, from un- (1) "not" + past participle of relieve (v.).ETD unrelieved (adj.).2

    unremarkable (adj.)

    1610s, from un- (1) "not" + remarkable (adj.). Related: Unremarkably.ETD unremarkable (adj.).2

    unremitting (adj.)

    1728, from un- (1) "not" + present participle of remit (v.). Related: Unremittingly.ETD unremitting (adj.).2

    unremitted (adj.)

    1640s, from un- (1) "not" + past participle of remit (v.).ETD unremitted (adj.).2

    unrepairable (adj.)

    1610s, from un- (1) "not" + repairable (adj.). Related: Unrepairably.ETD unrepairable (adj.).2

    unrepentant (adj.)

    late 14c., from un- (1) "not" + repentant (adj.).ETD unrepentant (adj.).2

    unrequited (adj.)

    1540s, from un- (1) "not" + past participle of requite (v.). The earliest reference is to love.ETD unrequited (adj.).2

    unreserved (adj.)

    1530s, "not restricted or withheld," from un- (1) "not" + past participle of reserve (v.). From 1713 as "open, frank." Related: Unreservedly.ETD unreserved (adj.).2

    unresisting (adj.)

    1620s, from un- (1) "not" + present participle of resist (v.).ETD unresisting (adj.).2

    unresolved (adj.)

    1570s, "undecided" (of questions), from un- (1) "not" + past participle of resolve (v.). Meaning "uncertain in opinion" is attested from 1590s.ETD unresolved (adj.).2

    unresponsive (adj.)

    1660s, "unable to reply," from un- (1) "not" + responsive (adj.). Meaning "not responding" is from 1775. Related: Unresponsiveness.ETD unresponsive (adj.).2

    unrest (n.)

    mid-14c., from un- (1) "not" + rest (n.). Similar formation in West Frisian onrest, Middle Low German unreste, German unrast, Middle Dutch onruste.ETD unrest (n.).2

    unrestrained (adj.)

    1580s, from un- (1) "not" + past participle of restrain (v.). Related: Unrestrainedly.ETD unrestrained (adj.).2

    unrestricted (adj.)

    1766, from un- (1) "not" + restricted.ETD unrestricted (adj.).2

    unrewarded (adj.)

    early 15c., from un- (1) "not" + past participle of reward (v.).ETD unrewarded (adj.).2

    unrighteous (adj.)

    1520s; see un- (1) "not" + righteous (adj.). In Middle English, the word was unrightwis, from Old English unrihtwis. Related: Unrighteously; unrighteousness.ETD unrighteous (adj.).2

    unripe (adj.)

    Old English unripe "premature" (in reference to death), from un- (1) "not" + ripe (adj.). Meaning "immature, not fully developed (of fruit, etc.) is recorded from mid-13c. Similar formation in Middle Dutch onrijp, Old High German unrifi, German unreif.ETD unripe (adj.).2

    unrivalled (adj.)

    also unrivaled, 1590s, from un- (1) "not" + past participle of rival (v.).ETD unrivalled (adj.).2

    unroll (v.)

    early 15c. (transitive), from un- (2) + roll (v.). Intransitive sense from 1580s. Related: Unrolled; unrolling.ETD unroll (v.).2

    unromantic (adj.)

    1731, from un- (1) "not" + romantic (adj.).ETD unromantic (adj.).2

    unruffled (adj.)

    1650s in figurative sense, from un- (1) "not" + past participle of ruffle (v.). Literal meaning, in reference to feathers, leaves, etc., is recorded from 1816.ETD unruffled (adj.).2

    unruly (adj.)

    "disposed to resist lawful restraint," c. 1400, from un- (1) "not" + obsolete ruly (adj.) "amenable to rule." Related: Unruliness.ETD unruly (adj.).2

    unsafe (adj.)

    1590s, "involving risk or danger," from un- (1) "not" + safe (adj.).ETD unsafe (adj.).2

    unsaid (adj.)

    Old English unsæd, from un- (1) "not" + past participle of say (v.). Similar formation in Middle Dutch ongeseit, German ungesagt, Old Norse usagðr.ETD unsaid (adj.).2

    unsalted (adj.)

    mid-15c., from un- (1) "not" + past participle of salt (v.). Similar formation in North Frisian unsalted, Swedish osaltad, Danish usaltet.ETD unsalted (adj.).2

    unsanitary (adj.)

    1871, from un- (1) "not" + sanitary (adj.).ETD unsanitary (adj.).2

    unsatiable (adj.)

    late 14c., from un- (1) "not" + satiable (adj.). Since 17c. the usual form is insatiable.ETD unsatiable (adj.).2

    unsatisfactory (adj.)

    1640s, from un- (1) "not" + satisfactory (adj.). Related: Unsatisfactorily; unsatisfactoriness.ETD unsatisfactory (adj.).2

    unsatisfied (adj.)

    early 15c., from un- (1) "not" + satisfied (adj.).ETD unsatisfied (adj.).2

    unsaturated (adj.)

    1756, from un- (1) "not" + past participle of saturate (v.).ETD unsaturated (adj.).2

    unsavory (adj.)

    also unsavoury, early 13c., "tasteless, insipid," from un- (1) "not" + savory (adj.). Meaning "unpleasant or disagreeable to the taste" is attested from late 14c.; of persons, from c. 1400. Related: Unsavoriness.ETD unsavory (adj.).2

    unscathed (adj.)

    late 14c., from un- (1) "not" + past participle of scathe (v.). Mainly in Scottish before 19c. Similar formation in Old Norse ostaðaðr, Swedish oskadad. An older word in the same sense was scatheless (c. 1200).ETD unscathed (adj.).2

    unschooled (adj.)

    1580s, "untrained," from un- (1) "not" + past participle of school (v.). A verb unschool is attested from 1820.ETD unschooled (adj.).2

    unscramble (v.)

    "restore to order," 1911, from un- (2) "reverse, opposite of" + scramble (v.). The original use is in a quip attributed to U.S. financier J.P. Morgan (1837-1913) about the impossibility of unscrambling an omelet.ETD unscramble (v.).2

    Related: Unscrambled; unscrambling.ETD unscramble (v.).3

    unscriptural (adj.)

    1650s, from un- (1) "not" + scriptural (adj.).ETD unscriptural (adj.).2

    unscrupulous (adj.)

    1803, from un- (1) "not" + scrupulous (adj.). Related: Unscrupulously; unscrupulousness.ETD unscrupulous (adj.).2

    unseal (v.)

    early 15c., from un- (2) "reverse, opposite of" + seal (v.). Similar formation in Middle Dutch ontsegelen, Old High German intsigilan. Related: Unsealed (late 14c.).ETD unseal (v.).2

    unsearchable (adj.)

    late 14c., from un- (1) "not" + searchable (adj.).ETD unsearchable (adj.).2

    unseasonable (adj.)

    mid-15c., "inopportune," from un- (1) "not" + seasonable (adj.). In reference to weather, "not appropriate to the time of year," it is recorded from 1510s. Related: Unseasonably.ETD unseasonable (adj.).2

    unseasoned (adj.)

    1580s, "not made palatable by seasoning," from un- (1) "not" + past participle of season (v.). Meaning "not habituated by experience" is recorded from c. 1600.ETD unseasoned (adj.).2

    unseat (v.)

    1590s, "to throw down from a seat" (especially on horseback), from un- (2) "reverse, opposite of" + seat (v.). Meaning "to deprive of rank or office" is attested from 1610s; especially of elected office in a representative body from 1834. Related: Unseated; unseating.ETD unseat (v.).2

    unsecure (adj.)

    1630s, from un- (1) "not" + secure (adj.). A useful differentiation from insecure since the latter word acquired a psychological sense.ETD unsecure (adj.).2

    unsecured (adj.)

    1780, from un- (1) "not" + past participle of secure (v.).ETD unsecured (adj.).2

    unseeded (adj.)

    1775, "not sown," from un- (1) "not" + past participle of seed (v.). From 1932 in the sports sense.ETD unseeded (adj.).2

    unseemly (adj.)

    c. 1300, "visually unpleasing, unattractive, ugly;" mid-14c., "unfitting, indecent, inappropriate," from un- (1) "not" + seemly (adj.). Similar formation in Old Norse usoemiligr. Related: Unseemliness.ETD unseemly (adj.).2

    unseen (adj.)

    early 13c., from un- (1) "not" + seen. Similar formation in Old English ungesewen, Middle Dutch ongesien, Dutch ongezien, Old High German ungesëhan, German ungesehen, Old Norse usenn.ETD unseen (adj.).2

    unselfish (adj.)

    1690s, from un- (1) "not" + selfish (adj.). Similar formation in Danish uselvisk, Swedish osjälfvisk. Related: Unselfishly; unselfishness.ETD unselfish (adj.).2

    unsentimental (adj.)

    1752, from un- (1) "not" + sentimental (adj.). Related: Unsentimentally.ETD unsentimental (adj.).2

    unseparable (adj.)

    late 14c. from un- (1) "not" + separable (adj.). The usual word now is inseparable.ETD unseparable (adj.).2

    unsettled (adj.)

    1590s, "not peaceful, not firmly established," from unsettle (v.) or else from un- (1) "not" + past participle of settle (v.). Meaning "not occupied by settlers" is attested from 1724.ETD unsettled (adj.).2

    unsettle (v.)

    1590s, "undo from a fixed position," from un- (2) "reverse, opposite of" + settle (v.). Of the mind, feelings, etc., attested from 1640s. Related: Unsettled; unsettling.ETD unsettle (v.).2

    unsex (v.)

    "deprive of the qualities considered typical of one's gender," c. 1600, from un- (2) "reverse, opposite of" + sex (n.). Related: Unsexed; unsexing.ETD unsex (v.).2

    unshakable (adj.)

    1610s; see un- (1) "not" + shake (v.) + -able. Of beliefs, etc., from 1670s.ETD unshakable (adj.).2

    unshaken (adj.)

    mid-15c., "not agitated," from un- (1) "not" + shaken. Meaning "not moved from a firm position" is recorded from 1540s.ETD unshaken (adj.).2

    unsheathe (v.)

    late 14c., from un- (2) "reverse, opposite of" + sheathe (v.). Related: Unsheathed; unsheathing.ETD unsheathe (v.).2

    unshod (adj.)

    "without shoes," Old English unscod; see un- (1) "not" + shod (adj.). Old English had also a verb unscogan "to unshoe."ETD unshod (adj.).2

    unshorn (adj.)

    Old English unscoren; see un- (1) "not" + shorn (adj.).ETD unshorn (adj.).2

    unsightly (adj.)

    1540s, "displeasing to the eye," from un- (1) "not" + sight (n.) + -ly (1). Similar formation in Middle Dutch onsichtlijc "invisible; ugly," Middle High German unsihtlih "invisible." Related: Unsightliness.ETD unsightly (adj.).2

    Middle English sightlie is attested from mid-15c. but only in the sense "visible;" unsightly is attested in Middle English only as an adverb meaning "invisibly" (late 15c.). Sightly as "pleasing to the eye" is from 1560s. Middle English also had unsighty "difficult or displeasing to look at" (early 15c., from sighty "attractive," late 14c.), also unsightily in the same sense (c. 1400).ETD unsightly (adj.).3

    unsinkable (adj.)

    1650s, from un- (1) "not" + sinkable (see sink (v.)).ETD unsinkable (adj.).2

    unskilled (adj.)

    1580s, from un- (1) "not" + skill.ETD unskilled (adj.).2

    unskillful (adj.)

    also unskilful, late 14c., "foolish," from un- (1) "not" + skillful (adj.). Meaning "inexpert" is from 1560s. Related: Unskillfully.ETD unskillful (adj.).2

    unsmiling (adj.)

    1730, from un- (1) "not" + present participle of smile (v.).ETD unsmiling (adj.).2

    unsociable (adj.)

    c. 1600, from un- (1) "not" + sociable (adj.). Insociable is older (1580s) but less common.ETD unsociable (adj.).2

    unsold (adj.)

    mid-14c., from un- (1) "not" + past participle of sell (v.).ETD unsold (adj.).2

    unsolicited (adj.)

    1580s, "unpetitioned, not approached with a request," from un- (1) "not" + past participle of solicit (v.). Meaning "not asked for, unsought" is from 1680s.ETD unsolicited (adj.).2

    unsolved (adj.)

    1660s, from un- (1) "not" + past participle of solve (v.).ETD unsolved (adj.).2

    unsophisticated (adj.)

    1620s, "unmixed," from un- (1) "not" + sophisticated (adj.). Meaning "ingenuous, natural, inexperienced" is recorded from 1660s.ETD unsophisticated (adj.).2

    unsorted (adj.)

    1530s, from un- (1) "not" + past participle of sort (v.).ETD unsorted (adj.).2

    unsought (adj.)

    early 13c., from un- (1) "not" + past participle of seek (v.). Similar formation in Middle Dutch ongesocht, Dutch ongezocht, Middle High German ungesuochet, German ungesucht.ETD unsought (adj.).2

    unsound (adj.)

    early 14c., of persons, "diseased, wounded," from un- (1) "not" + sound (adj.). Similar formation in Middle Low German unsund, Middle Dutch ongesont, German ungesund. Meaning "morally corrupt" is recorded from c. 1300; that of "not mentally healthy" is from 1540s. Sense of "not based on reasoning or fact" is attested from 1590s. Related: Unsoundly; unsoundness.ETD unsound (adj.).2

    unsparing (adj.)

    "showing no mercy," 1580s, from un- (1) "not" + sparing, attested from late 14c. as a present-participle adjective from spare (v.). Meaning "profuse" is from 1660s. Related: Unsparingly.ETD unsparing (adj.).2

    unspeakable (adj.)

    c. 1400, "inexpressible," from un- (1) "not" + speakable (see speak (v.)). Meaning "indescribably bad or wicked" is recorded from mid-15c. Related: Unspeakably.ETD unspeakable (adj.).2

    unspoiled (adj.)

    c. 1500, "not plundered," from un- (1) "not" + past participle of spoil (v.). Meaning "not deteriorated" is attested from 1732. A verb unspoil is attested from c. 1400, but it meant "despoil."ETD unspoiled (adj.).2

    unspoken (adj.)

    late 14c., from un- (1) "not" + past participle of speak (v.). Similar formation in Middle Dutch ongesproken, Middle Low German ungesproken.ETD unspoken (adj.).2

    unsporting (adj.)

    1822, from un- (1) "not" + sporting (adj.).ETD unsporting (adj.).2

    unsportsmanlike (adj.)

    1754, from un- (1) "not" + sportsmanlike.ETD unsportsmanlike (adj.).2

    unstable (adj.)

    early 13c., "apt to move," from un- (1) "not" + stable (adj.). Similar formation in Middle High German unstabel. Meaning "liable to fall" is recorded from c. 1300; sense of "fickle" is attested from late 13c. An Old English word for this was feallendlic, which might have become *fally.ETD unstable (adj.).2

    unstack (v.)

    1836, from un- (2) "reverse, opposite of" + stack (v.). Related: Unstacked; unstacking.ETD unstack (v.).2

    unsteady (v.)

    "make unsteady," 1530s, from un- (2) "reverse, opposite of" + steady (v.). Related: Unsteadied; unsteadying.ETD unsteady (v.).2

    unsteady (adj.)

    1590s, "not firm or secure in position," from un- (1) "not" + steady (adj.). Similar formation in Old Frisian unstadich, German unstätig, Middle Dutch onstadich. Meaning "marked by irregularity" is from 1680s. Related: Unsteadily (1550s).ETD unsteady (adj.).2

    unstick (v.)

    1706, from un- (2) "reverse, opposite of" + stick (v.). Related: Unsticking.ETD unstick (v.).2

    unstinted (adj.)

    late 15c., from un- (1) "not" + past participle of stint (v.).ETD unstinted (adj.).2

    unstinting (adj.)

    late 14c., "unceasing," from un- (1) "not" + present participle of stint (v.). Meaning "lavish" attested by 1834.ETD unstinting (adj.).2

    unstop (v.)

    "remove the stopper from," late 14c., from un- (2) "reverse, opposite of" + stop (v.). Related: Unstopped; unstopping.ETD unstop (v.).2

    unstoppable (adj.)

    1827; see un- (1) "not" + stop (v.) + -able.ETD unstoppable (adj.).2

    unstring (v.)

    1610s, from un- (2) "reverse, opposite of" + string (v.). Related: Unstringing.ETD unstring (v.).2

    unstressed (adj.)

    1879, from un- (1) "not" + past participle of stress (v.).ETD unstressed (adj.).2

    unstrung (adj.)

    1590s, "with strings relaxed" (of a harp, etc.), from un- (1) "not" + past participle of string (v.). Transferred sense of "weakened, unnerved" is recorded from 1690s.ETD unstrung (adj.).2

    unstuck (adj.)

    1840, "unpierced;" 1860, "unglued," from un- (1) "not" + past participle of stick (v.).ETD unstuck (adj.).2

    unstudied (adj.)

    late 14c., "not made a subject of study," from un- (1) "not" + past participle of study (v.). From 1650s as "natural, not artificial."ETD unstudied (adj.).2

    unsubscribe (v.)

    1570s (implied in unsubscribed), from un- (2) "reverse of" + subscribe (v.). Related: unsubscribing.ETD unsubscribe (v.).2

    unsubsidized (adj.)

    1756, from un- (1) "not" + past participle of subsidize (v.).ETD unsubsidized (adj.).2

    unsubstantial (adj.)

    mid-15c., from un- (1) "not" + substantial (adj.).ETD unsubstantial (adj.).2

    unsubstantiated (adj.)

    1775, from un- (1) "not" + past participle of substantiate (v.).ETD unsubstantiated (adj.).2

    unsuccessful (adj.)

    1610s, from un- (1) "not" + successful (adj.). Related: Unsuccessfully. A noun unsuccess "lack of success" is recorded from 1580s.ETD unsuccessful (adj.).2

    unsuitable (adj.)

    1590s, from un- (1) "not" + suitable (adj.). Related: Unsuitably; unsuitability.ETD unsuitable (adj.).2

    unsuited (adj.)

    "unfit," 1590s, from un- (1) "not" + past participle of suit (v.).ETD unsuited (adj.).2

    unsullied (adj.)

    1580s, from un- (1) "not" + past participle of sully (v.).ETD unsullied (adj.).2

    unsung (adj.)

    early 15c., "not uttered in a song," from un- (1) "not" + past participle of sing (v.). Similar formation in German ungesungen. Meaning "not celebrated" is recorded from 1660s.ETD unsung (adj.).2

    unsupervised (adj.)

    1845, from un- (1) "not" + past participle of supervise (v.).ETD unsupervised (adj.).2

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