unplanned (adj.)youdaoicibaDictYouDict[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.)youdaoicibaDictYouDict
1530s, from un- (1) "not" + pleasant (adj.). Related: Unpleasantly.
unpleasantness (n.)youdaoicibaDictYouDict
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.)youdaoicibaDictYouDict
1775, from un- (2) "reverse, opposite of" + plug (v.). Related: Unplugged; unplugging.
unpolished (adj.)youdaoicibaDictYouDict
late 14c., from un- (1) "not" + past participle of polish (v.). In reference to style, language, etc., attested from late 15c.
unpolluted (adj.)youdaoicibaDictYouDict
c. 1600, from un- (1) "not" + past participle of pollute (v.).
unpopular (adj.)youdaoicibaDictYouDict
1640s, from un- (1) "not" + popular (adj.). Related: Unpopularly.
unpopularity (n.)youdaoicibaDictYouDict
1735, from un- (1) "not" + popularity (n.).
unpracticed (adj.)youdaoicibaDictYouDict
also unpractised, 1550s, "unexpert," of persons, from un- (1) "not" + past participle of practice (v.). From 1530s as "not done, untried."
unprecedented (adj.)youdaoicibaDictYouDict
1620s, from un- (1) "not" + precedented. In common use from c. 1760.
unpredictable (adj.)youdaoicibaDictYouDict
1840, from un- (1) "not" + predictable (adj.). Related: Unpredictably; unpredictability.
unprejudiced (adj.)youdaoicibaDictYouDict
1610s, from un- (1) "not" + past participle of prejudice (v.).
unpremeditated (adj.)youdaoicibaDictYouDict
1590s, from un- (1) "not" + past participle of premeditate (v.).
unprepared (adj.)youdaoicibaDictYouDict
1540s, from un- (1) "not" + past participle of prepare (v.).
unprepossessing (adj.)youdaoicibaDictYouDict
1816, from un- (1) "not" + prepossessing (adj.).
unpresentable (adj.)youdaoicibaDictYouDict
1828, from un- (1) "not" + presentable (adj.).
unpretentious (adj.)youdaoicibaDictYouDict
1859, from un- (1) "not" + pretentious (adj.). Related: Unpretentiously; unpretentiousness.
unpreventable (adj.)youdaoicibaDictYouDict
1610s, from un- (1) "not" + preventable (adj.).
unprincipled (adj.)youdaoicibaDictYouDict
1630s, "not instructed" (in something), from un- (1) "not" + principled (adj.). Meaning "not honorable" is recorded from 1640s.
unproductive (adj.)youdaoicibaDictYouDict
1756, from un- (1) "not" + productive (adj.). Related: Unproductively; unproductiveness.