- unremarkable (adj.)
- 1610s, from un- (1) "not" + remarkable. Related: Unremarkably.
- unremitted (adj.)
- 1640s, from un- (1) "not" + past participle of remit.
- unremitting (adj.)
- 1728, from un- (1) "not" + present participle of remit. Related: Unremittingly.
- unrepairable (adj.)
- 1610s, from un- (1) "not" + repair + -able. Related: Unrepairably.
- unrepentant (adj.)
- late 14c., from un- (1) "not" + repentant.
- unrequited (adj.)
- 1540s, from un- (1) "not" + past participle of requite.
- unreservedly (adv.)
- 1650s, from un- (1) "not" + reserved (see reserve) + -ly (2).
- unresolved (adj.)
- 1570s, "undecided" (of questions), from un- (1) "not" + past participle of resolve (v.). Meaning "uncertain in opinion" is attested from 1590s.
- unresponsive (adj.)
- 1660s, "unable to reply," from un- (1) "not" + responsive. Meaning "not responding" is from 1775. Related: Unresponsiveness.
- unrest (n.)
- mid-14c., from un- (2) + rest (n.). Cf. West Frisian onrest, Middle Low German unreste, German unrast, Middle Dutch onruste.
- unrestrained (adj.)
- 1580s, from un- (1) "not" + past participle of restrain.
- unrestricted (adj.)
- 1766, from un- (1) "not" + restricted.
- unripe (adj.)
- Old English unripe "premature" (in reference to death), from un- (1) "not" + ripe. Meaning "immature, not fully developed (of fruit, etc.) is recorded from mid-13c. Cf. Middle Dutch onrijp, Old High German unrifi, German unreif.
- unrivalled (adj.)
- also unrivaled, 1590s, from un- (1) "not" + past participle of rival (v.).
- unroll (v.)
- early 15c., from un- (2) + roll (v.). Related: Unrolled; unrolling.
- unruffled (adj.)
- 1650s in figurative sense, from un- (1) "not" + past participle of ruffle. Literal meaning, in reference to feathers, leaves, etc., is recorded from 1816.
- unruly (adj.)
- c.1400, from un- (1) "not" + obsolete ruly "amenable to rule," from rule (n.).
- unsafe (adj.)
- 1590s, "involving risk or danger," from un- (1) "not" + safe (adj.).
- unsaid (adj.)
- Old English unsæd, from un- (1) "not" + past participle of say. Cf. Middle Dutch ongeseit, German ungesagt, Old Norse usagðr.
- unsalted (adj.)
- mid-15c., from un- (1) "not" + past participle of salt (v.). Cf. North Frisian unsalted, Swedish osaltad, Danish usaltet.
- unsanitary (adj.)
- 1871, from un- (1) "not" + sanitary.
- unsatiable (adj.)
- late 14c., from un- (1) "not" + satiable. Since 17c. the usual form is insatiable.
- unsatisfactory (adj.)
- 1640s, from un- (1) "not" + satisfactory.
- unsatisfied (adj.)
- early 15c., from un- (1) "not" + satisfied.
- unsaturated (adj.)
- 1756, from un- (1) "not" + past participle of saturate (v.).
- unsavory (adj.)
- 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.
- unscathed (adj.)
- late 14c., from un- (1) "not" + past participle of scathe. Mainly in Scottish before 19c. Cf. Old Norse ostaðaðr, Swedish oskadad.
- unschooled (adj.)
- 1580s, "untrained," from un- (1) "not" + past participle of school (v.).
- unscramble (v.)
- "restore to order," 1923, from un- (2) + scramble (v.). The original notion probably is from the old retort about the impossibility of unscrambling eggs. Related: Unscrambled; unscrambling.
- unscrupulous (adj.)
- 1803, from un- (1) "not" + scrupulous.
- unseal (v.)
- early 15c., from un- (2) + seal (v.). Cf. Middle Dutch ontsegelen, Old High German intsigilan. Related: Unsealed (late 14c.).
- unsearchable (adj.)
- late 14c.; see un- (1) "not" + search + -able.
- unseasonable (adj.)
- mid-15c., "inopportune," from un- (1) "not" + seasonable. In reference to weather, "not appropriate to the time of year," it is recorded from 1510s.
- 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.
- unseat (v.)
- 1590s, "to throw down from a seat" (especially on horseback), from un- (2) + 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.
- unsecure (adj.)
- 1630s, from un- (1) "not" + secure (adj.).
- unsecured (adj.)
- 1780, from un- (1) "not" + past participle of secure (v.).
- unseemly (adj.)
- early 14c., "unfitting, indecent," from un- (1) "not" + seemly. Cf. Old Norse usoemiligr.
- unseen (adj.)
- early 13c., from un- (1) "not" + past participle of see (v.). Cf. Old English ungesewen, Middle Dutch ongesien, Dutch ongezien, Old High German ungesëhan, German ungesehen, Old Norse usenn.
- unselfish (adj.)
- 1690s, from un- (1) "not" + selfish. Cf. Danish uselvisk, Swedish osjälfvisk. Related: Unselfishly; unselfishness.
- unsentimental (adj.)
- 1752, from un- (1) "not" + sentimental. Related: Unsentimentally.
- unseparable (adj.)
- late 14c. from un- (1) "not" + separable (see separate (v.)). The usual word now is inseparable.
- unsettle (v.)
- 1590s, "undo from a fixed position, from un- (2) + settle (v.). Of the mind, feelings, etc., attested from 1640s. Unsettled "not peaceful, not firmly established" is recorded from 1590s. Meaning "not occupied by settlers" is attested from 1724. Related: Unsettled; unsettling.
- unshakable (adj.)
- 1610s; see un- (1) "not" + shake (v.) + -able. Of beliefs, etc., from 1670s.
- unshaken (adj.)
- mid-15c., "not agitated," from un- (1) "not" + shaken. Meaning "not moved from a firm position" is recorded from 1540s.
- unsheathe (v.)
- late 14c. (implied in unsheathed), from un- (1) "not" + sheathe. Related: Unsheathing.
- unsightly (adj.)
- early 15c., "displeasing to the eye," from un- (1) "not" + sightly (see sight). Cf. Middle Dutch onsichtlijc "invisible, ugly," Middle High German unsihtlih "invisible." Related: Unsightliness.
- unsinkable (adj.)
- 1650s, from un- (1) "not" + sinkable (see sink (v.)).
- unskilled
- 1580s, from un- (1) "not" + past participle of skill.
- unskillful (adj.)
- late 14c., "foolish," from un- (1) "not" + skillful. Meaning "inexpert" is from 1560s.