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unanimity (n.)[unanimity 词源字典]: mid-15c., from Old French unanimite (14c.), from Late Latin unanimitatem (nominative unanimitas) "unanimity, concord," from unanimus (see unanimous).[unanimity etymology, unanimity origin, 英语词源]
unanimous (adj.): 1610s, from Latin unanimus "of one mind, in union," from unus "one" (see one) + animus "mind" (see animus). Related: Unanimously.
unannounced (adj.): 1775, from un- (1) "not" + past participle of announce (v.).
unanswerable (adj.): 1610s, "admitting of no answer," from un- (1) "not" + answerable.
unanswered (adj.): late 14c., from un- (1) "not" + past participle of answer (v.).
unanticipated (adj.): 1741, from un- (1) "not" + past participle of anticipate (v.).
unapologetic (adj.): 1834, from un- (1) "not" + apologetic. Related: Unapologetically.
unappeasable (adj.): 1560s, from un- (1) "not" + appeasable. Related: Unappeasably.
Desolate winds that cry over the wandering sea;
Desolate winds that hover in the flaming West;
Desolate winds that beat the doors of Heaven, and beat
The doors of Hell and blow there many a whimpering ghost;
O heart the winds have shaken, the unappeasable host
Is comelier than candles at Mother Mary's feet.

[W.B. Yeats, "The Unappeasable Host," 1899]
unappreciated (adj.): 1809, from un- (1) "not" + past participle of appreciate (v.).
unappreciative (adj.): 1834, from un- (1) "not" + appreciative. Related: Unappreciatively; unappreciativeness.
unapprehended (adj.): 1590s, "not understood;" 1610s, "not taken or arrested," from un- (1) "not" + past participle of apprehend (v.).
unapproachable (adj.): 1580s, of places, from un- (1) "not" + approachable. Of persons, "distant, aloof," attested from 1848. Related: Unapproachably.
unapproved (adj.): early 15c., from un- (1) "not" + past participle of approve (v.).
unarmed (adj.): c. 1300, "with armor removed," from un- (1) "not" + armed, or else past participle adjective from unarm "strip of armor" (c. 1300), from un- (2) "opposite of" + arm (v.). Meaning "not fitted to attack, weaponless" is from late 14c.
unary (adj.): 1923, from Latin unus "one" (see one) on model of binary, etc.
unashamed (adj.): c. 1500, implied in unashamedness, from un- (1) "not" + ashamed. Related: Unashamedly.
unasked (adj.): mid-13c., "uninvited," from un- (1) "not" + past participle of ask (v.). Old English had ungeaxod.
unaspiring (adj.): 1680s, from un- (1) "not" + present participle of aspire (v.).
unassailable (adj.): 1590s, from un- (1) "not" + assailable (see assail (v.)). Related: Unassailably.
unassimilated (adj.): 1748, from un- (1) "not" + past participle of assimilate (v.).