- unreliable (adj.)
[unreliable 词源字典] - 1835 (Fanny Kemble), from un- (1) "not" + reliable (adj.).[unreliable etymology, unreliable origin, 英语词源]
- unrelieved (adj.)
- "monotonous, unvarying," 1764, from un- (1) "not" + past participle of relieve (v.).
- unremarkable (adj.)
- 1610s, from un- (1) "not" + remarkable (adj.). Related: Unremarkably.
- unremitted (adj.)
- 1640s, from un- (1) "not" + past participle of remit (v.).
- unremitting (adj.)
- 1728, from un- (1) "not" + present participle of remit (v.). Related: Unremittingly.
- unrepairable (adj.)
- 1610s, from un- (1) "not" + repairable (adj.). Related: Unrepairably.
- unrepentant (adj.)
- late 14c., from un- (1) "not" + repentant (adj.).
- unrequited (adj.)
- 1540s, from un- (1) "not" + past participle of requite (v.). The earliest reference is to love.
- unreserved (adj.)
- 1530s, "not restricted or withheld," from un- (1) "not" + past participle of reserve (v.). From 1713 as "open, frank." Related: Unreservedly.
- unresisting (adj.)
- 1620s, from un- (1) "not" + present participle of resist (v.).
- 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 (adj.). Meaning "not responding" is from 1775. Related: Unresponsiveness.
- 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.
- unrestrained (adj.)
- 1580s, from un- (1) "not" + past participle of restrain (v.). Related: Unrestrainedly.
- unrestricted (adj.)
- 1766, from un- (1) "not" + restricted.
- unrewarded (adj.)
- early 15c., from un- (1) "not" + past participle of reward (v.).
- unrighteous (adj.)
- 1520s; see un- (1) "not" + righteous (adj.). In Middle English, the word was unrightwis, from Old English unrihtwis. Related: Unrighteously; unrighteousness.
- 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.
- unrivalled (adj.)
- also unrivaled, 1590s, from un- (1) "not" + past participle of rival (v.).
- unroll (v.)
- early 15c. (transitive), from un- (2) + roll (v.). Intransitive sense from 1580s. Related: Unrolled; unrolling.
