unsupervised (adj.)youdaoicibaDictYouDict
1845, from un- (1) "not" + past participle of supervise (v.).
unsupported (adj.)youdaoicibaDictYouDict
early 15c., from un- (1) "not" + past participle of support (v.).
unsure (adj.)youdaoicibaDictYouDict
c. 1400, "not safe against attack," also "lacking certainty," from un- (1) "not" + sure (adj.).
unsurmountable (adj.)youdaoicibaDictYouDict
"incapable of being overcome," 1701, from un- (1) "not" + surmountable.
unsurpassable (adj.)youdaoicibaDictYouDict
1610s, from un- (1) "not" + surpassable (see surpass (v.)).
unsurpassed (adj.)youdaoicibaDictYouDict
1775, from un- (1) "not" + past participle of surpass (v.).
unsuspected (adj.)youdaoicibaDictYouDict
1520s, from un- (1) "not" + past participle of suspect (v.).
unsuspecting (adj.)youdaoicibaDictYouDict
1590s, from un- (1) "not" + present participle of suspect (v.).
unsustainable (adj.)youdaoicibaDictYouDict
1670s, from un- (1) "not" + sustainable (adj.).
unswayed (adj.)youdaoicibaDictYouDict
1590s, from un- (1) "not" + past participle of sway (v.).
unsweetened (n.)youdaoicibaDictYouDict
1775, "not having been sweetened," from un- (1) "not" + past participle of sweeten (v.); or else, if the sense is "with sweetness removed," from unsweeten (v.), which is attested from 1610s.
unswerving (adj.)youdaoicibaDictYouDict
1690s, from un- (1) "not" + present participle of swerve (v.).
unsympathetic (adj.)youdaoicibaDictYouDict
1785, from un- (1) "not" + sympathetic (adj.).
unsystematic (adj.)youdaoicibaDictYouDict
1770, from un- (1) "not" + systematic (adj.).
untainted (adj.)youdaoicibaDictYouDict
1580s, in the moral sense; c. 1600 in the physical sense; from un- (1) "not" + past participle of taint (v.). Earlier was untained (mid-15c.), from a Middle English variant of taint (v.).
untamed (adj.)youdaoicibaDictYouDict
mid-14c., from un- (1) "not" + past participle of tame (v.). Similar formation in Old English untemed, Old Norse utamdr, Old High German ungizamot.
untangible (adj.)youdaoicibaDictYouDict
1775, from un- (1) "not" + tangible (adj.).
untangle (v.)youdaoicibaDictYouDict
1540s, from un- (2) "reverse, opposite of" + tangle (v.). Related: Untangled; untangling.
untapped (adj.)youdaoicibaDictYouDict
1775, from un- (1) "not" + past participle of tap (v.). Figurative use from c. 1890.
untaught (adj.)youdaoicibaDictYouDict
mid-14c., "not instructed or educated," from un- (1) "not" + taught. Hence "spontaneous, natural" (mid-15c.).