- unskilled (adj.)
[unskilled 词源字典] - 1580s, from un- (1) "not" + skill.[unskilled etymology, unskilled origin, 英语词源]
- unskillful (adj.)
- also unskilful, late 14c., "foolish," from un- (1) "not" + skillful (adj.). Meaning "inexpert" is from 1560s. Related: Unskillfully.
- unsmiling (adj.)
- 1730, from un- (1) "not" + present participle of smile (v.).
- unsociable (adj.)
- c. 1600, from un- (1) "not" + sociable (adj.).
- unsold (adj.)
- mid-14c., from un- (1) "not" + past participle of sell (v.).
- unsolicited (adj.)
- 1580s, "unpetitioned, not approached with a request," from un- (1) "not" + past participle of solicit (v.). Meaning "not asked for, unsought" is from 1680s.
- unsolved (adj.)
- 1660s, from un- (1) "not" + past participle of solve (v.).
- unsophisticated (adj.)
- 1620s, "unmixed," from un- (1) "not" + sophisticated (adj.). Meaning "ingenuous, natural, inexperienced" is recorded from 1660s.
- unsorted (adj.)
- 1530s, from un- (1) "not" + past participle of sort (v.).
- unsought (adj.)
- early 13c., from un- (1) "not" + past participle of seek (v.). Similar formation in Middle Dutch ongesocht, Dutch ongezocht, Middle High German ungesuochet, German ungesucht.
- unsound (adj.)
- early 14c., of persons, "diseased, wounded," from un- (1) "not" + sound (adj.). Similar formation in Middle Low German unsund, Middle Dutch ongesont, German ungesund. Meaning "morally corrupt" is recorded from c. 1300; that of "not mentally healthy" is from 1540s. Sense of "not based on reasoning or fact" is attested from 1590s. Related: Unsoundly; unsoundness.
- unsparing (adj.)
- "showing no mercy," 1580s, from un- (1) "not" + sparing, attested from late 14c. as a present participle adjective from spare (v.). Meaning "profuse" is from 1660s. Related: Unsparingly.
- unspeakable (adj.)
- c. 1400, "inexpressible," from un- (1) "not" + speakable (see speak (v.)). Meaning "indescribably bad or wicked" is recorded from mid-15c. Related: Unspeakably.
- unspoiled (adj.)
- c. 1500, "not plundered," from un- (1) "not" + past participle of spoil (v.). Meaning "not deteriorated" is attested from 1732. A verb unspoil is attested from c. 1400, but it meant "despoil."
- unspoken (adj.)
- late 14c., from un- (1) "not" + past participle of speak (v.). Similar formation in Middle Dutch ongesproken, Middle Low German ungesproken.
- unsporting (adj.)
- 1822, from un- (1) "not" + sporting (adj.).
- unsportsmanlike (adj.)
- 1754, from un- (1) "not" + sportsmanlike.
- unstable (adj.)
- early 13c., "apt to move," from un- (1) "not" + stable (adj.). Similar formation in Middle High German unstabel. Meaning "liable to fall" is recorded from c. 1300; sense of "fickle" is attested from late 13c. An Old English word for this was feallendlic, which might have become *fally.
- unstack (v.)
- 1836, from un- (2) "reverse, opposite of" + stack (v.). Related: Unstacked; unstacking.
- unsteady (adj.)
- 1590s, "not firm or secure in position," from un- (1) "not" + steady (adj.). Similar formation in Old Frisian unstadich, German unstätig, Middle Dutch onstadich. Meaning "marked by irregularity" is from 1680s. Related: Unsteadily (1550s).
