- unofficial (adj.)
[unofficial 词源字典] - 1798, from un- (1) "not" + official (adj.). Related: Unofficially.[unofficial etymology, unofficial origin, 英语词源]
- unopposed (adj.)
- 1650s, from un- (1) "not" + past participle of oppose (v.).
- unorganized (adj.)
- 1680s, from un- (1) "not" + past participle of organize (v.).
- unoriginal (adj.)
- 1660s, "uncreated, without an origin," from un- (1) "not" + original (adj.). Meaning "derivative, second-hand" is recorded from 1774. Related: Unoriginality.
- unorthodox (adj.)
- 1650s, from un- (1) "not" + orthodox (adj.).
- unorthodoxy (n.)
- 1704, from unorthodox + -y (4).
- unostentatious (adj.)
- 1747, from un- (1) "not" + ostentatious (adj.). Related: Unostentatiously.
- unowned (adj.)
- 1610s, "unpossessed," from un- (1) "not" + past participle of own (v.). From 1715 as "unacknowledged."
- unpack (v.)
- late 15c., from un- (2) "reverse, opposite of" + pack (v.). Similar formation in Dutch ontpakken. Related: Unpacked; unpacking.
- unpaid (adj.)
- late 14c., in reference to persons, from un- (1) "not" + past participle of pay (v.). Of debts, attested from late 15c.
- unpalatable (adj.)
- 1680s, from un- (1) "not" + palatable (adj.). Related: Unpalatably.
- unparalleled (adj.)
- 1590s, from un- (1) "not" + past participle of parallel (v.). Unparallel as an adjective is recorded from 1650s.
- unpardonable (adj.)
- 1520s, from un- (1) "not" + pardonable (adj.). Related: Unpardonably.
- unpatriotic (adj.)
- 1775, from un- (1) "not" + patriotic.
- unpaved (adj.)
- 1530s, from un- (1) "not" + past participle of pave (v.).
- unpenetrable (adj.)
- c. 1400, from un- (1) "not" + penetrable (adj.). The usual word now is impenetrable.
- unperceived (adj.)
- mid-14c., from un- (1) "not" + past participle of perceive (v.).
- unpersuasive (adj.)
- 1748, from un- (1) "not" + persuasive (adj.). Related: Unpersuasively.
- unperturbed (adj.)
- early 15c., from un- (1) "not" + past participle of perturb (v.).
- unplace (v.)
- from un- (2) "reverse, opposite of" + place (v.). Related: Unplaced; unplacing.
