英语词源字典 - 在线词源网站

unsteady (v.): "make unsteady," 1530s, from un- (2) "reverse, opposite of" + steady (v.). Related: Unsteadied; unsteadying.
unstick (v.): 1706, from un- (2) "reverse, opposite of" + stick (v.). Related: Unsticking.
unstinted (adj.): late 15c., from un- (1) "not" + past participle of stint (v.).
unstinting (adj.): late 14c., "unceasing," from un- (1) "not" + present participle of stint (v.). Meaning "lavish" attested by 1834.
unstop (v.): "remove the stopper from," late 14c., from un- (2) "reverse, opposite of" + stop (v.). Related: Unstopped; unstopping.
unstoppable (adj.): 1827; see un- (1) "not" + stop (v.) + -able.
unstressed (adj.): 1879, from un- (1) "not" + past participle of stress (v.).
unstring (v.): 1610s, from un- (2) "reverse, opposite of" + string (v.). Related: Unstringing.
unstrung (adj.): 1590s, "with strings relaxed" (of a harp, etc.), from un- (1) "not" + past participle of string (v.). Transferred sense of "weakened, unnerved" is recorded from 1690s.
unstuck (adj.): 1840, "unpierced;" 1860, "unglued," from un- (1) "not" + past participle of stick (v.).
unstudied (adj.): late 14c., "not made a subject of study," from un- (1) "not" + past participle of study (v.). From 1650s as "natural, not artificial."
unsubscribe (v.): 1570s (implied in unsubscribed), from un- (2) "reverse of" + subscribe (v.). Related: unsubscribing.
unsubsidized (adj.): 1756, from un- (1) "not" + past participle of subsidize (v.).
unsubstantial (adj.): mid-15c., from un- (1) "not" + substantial (adj.).
unsubstantiated (adj.): 1775, from un- (1) "not" + past participle of substantiate (v.).
unsuccessful (adj.): 1610s, from un- (1) "not" + successful (adj.). Related: Unsuccessfully. A noun unsuccess "lack of success" is recorded from 1580s.
unsuitable (adj.): 1590s, from un- (1) "not" + suitable (adj.). Related: Unsuitably; unsuitability.
unsuited (adj.): "unfit," 1590s, from un- (1) "not" + past participle of suit (v.).
unsullied (adj.): 1580s, from un- (1) "not" + past participle of sully (v.).
unsung (adj.): early 15c., "not uttered in a song," from un- (1) "not" + past participle of sing (v.). Similar formation in German ungesungen. Meaning "not celebrated" is recorded from 1660s.