- unethical (adj.)
[unethical 词源字典] - 1871, from un- (1) "not" + ethical. Related: Unethically.[unethical etymology, unethical origin, 英语词源]
- uneven (adj.)
- Old English unefen "unequal, unlike, anomalous, irregular," from un- (1) "not" + even (adj.). Similar formation in Old Frisian oniovn, Middle Dutch oneven, Old High German uneban, German uneben, Old Norse ujafn. Meaning "broken, rugged" (in reference to terrain, etc.) is recorded from late 13c. Related: Unevenly; unevenness.
- uneventful (adj.)
- 1800, from un- (1) "not" + eventful. Related: Uneventfully.
- unevitable (adj.)
- from un- (1) "not" + evitable. The usual word is inevitable. Related: Unevitably.
- unexamined (adj.)
- late 15c., from un- (1) "not" + past participle of examine (v.).
- unexceptionable (adj.)
- 1660s, from un- (1) "not" + exceptionable.
- unexceptional (adj.)
- from un- (1) "not" + exceptional (adj.).
- unexcusable (adj.)
- late 14c., from un- (1) "not" + excusable. The usual word is inexcusable. Related: Unexcusably.
- unexpected (adj.)
- 1580s, from un- (1) "not" + past participle of expect (v.). Related: Unexpectedly.
- unexperienced (adj.)
- 1560s, from un- (1) "not" + past participle of experience (v.).
- unexplainable (adj.)
- 1711, from un- (1) "not" + explain + -able. Related: Unexplainably.
- unexplained (adj.)
- 1721, from un- (1) "not" + past participle of explain (v.).
- unexplored (adj.)
- 1690s, from un- (1) "not" + past participle of explore (v.).
- unexpurgated (adj.)
- 1882, from un- (1) "not" + past participle of expurgate (v.).
- unfading (adj.)
- from un- (1) "not" + past participle of fade (v.).
- unfailing (adj.)
- late 14c., "never coming to an end, unceasing, everlasting, inexhaustible," from un- (1) "not" + present participle of fail (v.). Related: Unfailingly.
- unfair (adj.)
- Old English unfægr "unlovely, not beautiful, deformed, hideous, unlovable," from un- (1) "not" + fair (adj.). Similar formation in Old Norse ufagr, Gothic unfagrs. Meaning "wicked, evil, bad" is recorded from c. 1300. Sense of "not equitable, unjust" is first recorded 1713. Related: Unfairly.
- unfairness (n.)
- Old English unfægernes "ugliness, disfigurement;" see unfair + -ness.
- unfaithful (adj.)
- mid-14c., "acting falsely," from un- (1) "not" + faithful. In Middle English it also had a sense of "infidel, unbelieving, irreligious" (late 14c.). Sense of "not faithful in marriage" is attested from 1828. Related: Unfaithfully; unfaithfulness.
- unfaltering (adj.)
- 1660s, from un- (1) "not" + present participle of falter (v.). Related: Unfalteringly.
