英语词源字典 - 在线词源网站

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.