- unplanned (adj.)
[unplanned 词源字典] - by 1804, from un- (1) "not" + past participle of plan (v.).[unplanned etymology, unplanned origin, 英语词源]
- unpleasant (adj.)
- 1530s, from un- (1) "not" + pleasant (adj.). Related: Unpleasantly.
- unpleasantness (n.)
- 1540s, "state or quality of being unpleasant," from unpleasant + -ness. By 1835 as "a slight quarrel, a minor misunderstanding." The late unpleasantness as a humorously polite Southern description of the American Civil War is attested from 1868.
- unplug (v.)
- 1775, from un- (2) "reverse, opposite of" + plug (v.). Related: Unplugged; unplugging.
- unpolished (adj.)
- late 14c., from un- (1) "not" + past participle of polish (v.). In reference to style, language, etc., attested from late 15c.
- unpolluted (adj.)
- c. 1600, from un- (1) "not" + past participle of pollute (v.).
- unpopular (adj.)
- 1640s, from un- (1) "not" + popular (adj.). Related: Unpopularly.
- unpopularity (n.)
- 1735, from un- (1) "not" + popularity (n.).
- unpracticed (adj.)
- also unpractised, 1550s, "unexpert," of persons, from un- (1) "not" + past participle of practice (v.). From 1530s as "not done, untried."
- unprecedented (adj.)
- 1620s, from un- (1) "not" + precedented. In common use from c. 1760.
- unpredictable (adj.)
- 1840, from un- (1) "not" + predictable (adj.). Related: Unpredictably; unpredictability.
- unprejudiced (adj.)
- 1610s, from un- (1) "not" + past participle of prejudice (v.).
- unpremeditated (adj.)
- 1590s, from un- (1) "not" + past participle of premeditate (v.).
- unprepared (adj.)
- 1540s, from un- (1) "not" + past participle of prepare (v.).
- unprepossessing (adj.)
- 1816, from un- (1) "not" + prepossessing (adj.).
- unpresentable (adj.)
- 1828, from un- (1) "not" + presentable (adj.).
- unpretentious (adj.)
- 1859, from un- (1) "not" + pretentious (adj.). Related: Unpretentiously; unpretentiousness.
- unpreventable (adj.)
- 1610s, from un- (1) "not" + preventable (adj.).
- unprincipled (adj.)
- 1630s, "not instructed" (in something), from un- (1) "not" + principled (adj.). Meaning "not honorable" is recorded from 1640s.
- unproductive (adj.)
- 1756, from un- (1) "not" + productive (adj.). Related: Unproductively; unproductiveness.
