unearned (adj.)youdaoicibaDictYouDict[unearned 词源字典]
c. 1200, from un- (1) "not" + past participle of earn (v.). Unearned income is recorded from 1889.[unearned etymology, unearned origin, 英语词源]
unearth (v.)youdaoicibaDictYouDict
"to dig up," mid-15c., from un- (2) "opposite of" + earth (v.) "bury (a corpse) in the ground" (c. 1400, from earth (n.)). Related: Unearthed; unearthing.
unearthly (adj.)youdaoicibaDictYouDict
1610s, "heavenly, sublime," from un- (1) "not" + earthly. Sense of "ghostly, weird" first recorded 1802. Related: Unearthliness.
uneasy (adj.)youdaoicibaDictYouDict
late 13c., "not comforting, causing trouble," from un- (1) "not" + easy (adj.). Meaning "disturbed in mind" is attested from 1670s. Related: Uneasily; uneasiness.
uneducated (adj.)youdaoicibaDictYouDict
1580s, from un- (1) "not" + past participle of educate (v.).
unelectable (adj.)youdaoicibaDictYouDict
also un-electable, 1962, from un- (1) "not" + electable.
unemancipated (adj.)youdaoicibaDictYouDict
1775, from un- (1) "not" + past participle of emancipate (v.).
unemotional (adj.)youdaoicibaDictYouDict
1819, from un- (1) "not" + emotional (adj.). Related: Unemotionally.
unemployed (adj.)youdaoicibaDictYouDict
1600, "at leisure, not occupied," from un- (1) "not" + past participle of employ (v.). Meaning "temporarily out of work" is from 1660s. The noun meaning "unemployed persons collectively" is from 1782.
No man has hired us
With pocketed hands
And lowered faces
We stand about in open places
And shiver in unlit rooms ...

[T.S. Eliot, "Choruses from the Rock"]
unemployment (n.)youdaoicibaDictYouDict
1887, from un- (1) "not" + employment.
unencumbered (adj.)youdaoicibaDictYouDict
1722, from un- (1) "not" + past participle of encumber (v.).
unending (adj.)youdaoicibaDictYouDict
1660s, from un- (1) "not" + present participle of end (v.).
unendurable (adj.)youdaoicibaDictYouDict
1620s, from un- (1) "not" + endurable. Related: Unendurably.
unenlightened (adj.)youdaoicibaDictYouDict
1660s, "not lit up," from un- (1) "not" + past participle of enlighten (v.). Meaning "not mentally illuminated" is attested from 1650s.
unenthusiastic (adj.)youdaoicibaDictYouDict
1805, from un- (1) "not" + enthusiastic (adj.). Related: Unenthusiastically.
unenviable (adj.)youdaoicibaDictYouDict
1640s, from un- (1) "not" + enviable (adj.). Related: Unenviably.
unequal (adj.)youdaoicibaDictYouDict
1530s, "unjust, unfair," from un- (1) "not" + equal (adj.). Meaning "not the same in amount, size, quality, etc." is recorded from 1560s (inequal in this sense is from late 14c.). Sense of "inadequate, insufficient" (to some task) is attested from 1690s. Related: Unequally.
unequivocal (adj.)youdaoicibaDictYouDict
1784, from un- (1) "not" + equivocal. Related: Unequivocally.
unerring (adj.)youdaoicibaDictYouDict
1640s (implied in unerringly), from un- (1) "not" + verbal noun from err. Related: Unerringly.
UNESCOyoudaoicibaDictYouDict
acronym from United Nations Educational, Scientific and Cultural Organization, which was created in 1945.