unholy (adj.)youdaoicibaDictYouDict[unholy 词源字典]
Old English unhalig, "impious, profane, wicked," from un- (1) "not" + halig (see holy). Similar formation in Middle Dutch onheilich, Old Norse uheilagr, Danish unhellig, Swedish ohelig. In reference to actions, it is attested from late 14c. Colloquial sense of "awful, dreadful" is recorded from 1842.[unholy etymology, unholy origin, 英语词源]
unhonored (adj.)youdaoicibaDictYouDict
1510s, also unhonoured, from un- (1) "not" + past participle of honor (v.).
unhorse (v.)youdaoicibaDictYouDict
late 14c., "to throw (someone) from his horse," from un- (2) "opposite of" + horse (v.). Similar formation in Middle Dutch ontorsen.
unhuman (adj.)youdaoicibaDictYouDict
1540s, "inhumane, cruel," from un- (1) "not" + human (adj.). Meaning "destitute of human qualities; superhuman" is from 1782.
unhygienic (adj.)youdaoicibaDictYouDict
1883, from un- (1) "not" + hygenic.
uni-youdaoicibaDictYouDict
word-forming element meaning "having one only," from Latin uni-, comb. form of unus (see one).
UniateyoudaoicibaDictYouDict
"pertaining to an Eastern Christian church that acknowledges the supremacy of the Pope," 1833, from Russian uniyat, from unia "unity, union," from Latin unus "one" (see one).
unicameral (adj.)youdaoicibaDictYouDict
1853, from uni- "one" + Late Latin camera "chamber" (see camera) + -al (1).
UNICEFyoudaoicibaDictYouDict
by 1948, acronym from United Nations International Children's Emergency Fund, which was created in 1946 (the name was changed 1953 to United Nations Children's Fund but the acronym endured).
unicellular (adj.)youdaoicibaDictYouDict
1858; see uni- + cellular.
unicorn (n.)youdaoicibaDictYouDict
early 13c., from Old French unicorne, from Late Latin unicornus (Vulgate), from noun use of Latin unicornis (adj.) "having one horn," from uni- "one" (see uni-) + cornus "horn," from PIE *ker- (1) "horn; head, uppermost part of the body" (see horn (n.)).

The Late Latin word translates Greek monoceros, itself rendering Hebrew re'em (Deut. xxxiii.17 and elsewhere), which probably was a kind of wild ox. According to Pliny, a creature with a horse's body, deer's head, elephant's feet, lion's tail, and one black horn two cubits long projecting from its forehead. Compare German Einhorn, Welsh ungorn, Breton uncorn, Old Church Slavonic ino-rogu.
unicycle (n.)youdaoicibaDictYouDict
1869, American English, from Latin uni- "one" (see uni-) + -cycle, from bicycle (from Greek kyklos "circle, wheel").
unidentifiable (adj.)youdaoicibaDictYouDict
1859, from un- + identifiable.
unidentified (adj.)youdaoicibaDictYouDict
1860, from un- (1) "not" + past participle of identify (v.).
unidirectional (adj.)youdaoicibaDictYouDict
1883, from uni- + directional (see direction).
unification (n.)youdaoicibaDictYouDict
1849, noun of action from unify (v.). Unification Church was founded 1954.
uniform (adj.)youdaoicibaDictYouDict
1530s, "of one form," from Middle French uniforme (14c.), from Latin uniformis "having only one form or shape," from uni- "one" (see uni-) + forma "form" (see form (n.)). Related: Uniformly.
uniform (n.)youdaoicibaDictYouDict
"distinctive clothes worn by one group," 1748, from French uniforme, from the adjective (see uniform (adj.)).
uniform (v.)youdaoicibaDictYouDict
1680s, "to make alike," from uniform (adj.). Meaning "to dress in a uniform" is from 1861. Related: Uniformed.
uniformitarian (n.)youdaoicibaDictYouDict
1840 in geology, from uniformity + -arian.