unmerciful (adj.)
late 15c., from un- (1) "not" + merciful (adj.). Related: Unmercifully.
unmerited (adj.)
1640s, from un- (1) "not" + past participle of merit (v.).
"An ingenuous mind feels in unmerited praise the bitterest reproof. If you reject it you are unhappy, if you accept it you are undone." [Walter Savage Landor, "Imaginary Conversations"]
unmet (adj.)
c.1600, from un- (1) "not" + past participle of meet (v.).
unmindful (adj.)
late 14c., from un- (1) "not" + mindful (adj.).
unmistakable (adj.)
1660s, from un- (1) "not" + mistake (v.) + -able. Related: Unmistakably.
unmitigated (adj.)
1590s, from un- (1) "not" + past participle of mitigate (v.).
unmodified (adj.)
1792, from un- (1) "not" + past participle of modify (v.).
unmolested (adj.)
1530s, from un- (1) "not" + past participle of molest (v.).
unmoor (v.)
late 15c., "to free from moorings," from un- (2) "reverse, opposite of" + moor (v.). Related: Unmoored.
unmotivated (adj.)
"lacking in motivation," by 1917, from un- (1) "not" + past participle of motivate. Meaning "lacking in motive" is attested from 1871. Unmotived is from 1794.
unmounted (adj.)
1590s, from un- (1) "not" + past participle of mount (v.).
unmovable (adj.)
late 14c., from un- (1) "not" + movable (adj.).
unmoved (adj.)
late 14c., "not affected by emotion or excitement," from un- (1) "not" + past participle of move (v.). Meaning "fixed in position" is from mid-15c.
unmuzzled (adj.)
c.1600, from un- (1) "not" + past participle of muzzle (v.), or past participle of unmuzzle (v.), which is attested from c.1600.
unnamed (adj.)
c.1500, "not mentioned by name." from un- (1) "not" + past participle of name (v.). Similar formation in Old Frisian unnamed, Middle Dutch ongenaemt.
unnatural (adj.)
early 15c., "not in accord with physical nature," from un- (1) "not" + natural (adj.). Meaning "artificial" is attested from 1746; that of "at variance with moral standards" is from 1520s. Related: Unnaturally; unnaturalness.
unnecessary (adj.)
1540s, from un- (1) "not" + necessary (adj.). Related: Unnecessarily.
unneeded (adj.)
1725, from un- (1) "not" + past participle of need (v.).
unnerve (v.)
1620s, "to destroy the strength of," from un- (2) "reverse, opposite of" + nerve (v.). Meaning "to deprive of courage" is recorded from 1704. Related: Unnerved; unnerving.
unnoticed (adj.)
1720, from un- (1) "not" + past participle of notice (v.).
unnumbered (adj.)
late 14c., from un- (1) "not" + past participle of number (v.).
unobjectionable (adj.)
1793, from un- (1) "not" + objectionable (adj.).
unobservant (adj.)
1660s, from un- (1) "not" + observant (adj.).
unobserved (adj.)
1610s, from un- (1) "not" + past participle of observe (v.).
unobstructed (adj.)
1650s, from un- (1) "not" + past participle of obstruct (v.).
unobtainable (adj.)
1775, from un- (1) "not" + obtainable (adj.). Related: Unobtainability.
unobtrusive (adj.)
from un- (1) + obtrusive (adj.). Related: Unobtrusively; unobtrusiveness.
unoccupied (adj.)
late 14c., "idle," from un- (1) "not" + past participle of occupy (v.). In reference to ground, etc., "not possessed, not made use of," from early 15c.
unoffending (adj.)
1560s, from un- (1) "not" + present participle of offend (v.).
unofficial (adj.)
1798, from un- (1) "not" + official (adj.). Related: Unofficially.
unopposed (adj.)
1650s, from un- (1) "not" + past participle of oppose (v.).
unorganized (adj.)
1680s, from un- (1) "not" + past participle of organize (v.).
unoriginal (adj.)
1660s, "uncreated, without an origin," from un- (1) "not" + original (adj.). Meaning "derivative, second-hand" is recorded from 1774. Related: Unoriginality.
unorthodox (adj.)
1650s, from un- (1) "not" + orthodox (adj.).
unorthodoxy (n.)
1704, from unorthodox + -y (4).
unostentatious (adj.)
1747, from un- (1) "not" + ostentatious (adj.). Related: Unostentatiously.
unowned (adj.)
1610s, "unpossessed," from un- (1) "not" + past participle of own (v.). From 1715 as "unacknowledged."
unpack (v.)
late 15c., from un- (2) "reverse, opposite of" + pack (v.). Similar formation in Dutch ontpakken. Related: Unpacked; unpacking.
unpaid (adj.)
late 14c., in reference to persons, from un- (1) "not" + past participle of pay (v.). Of debts, attested from late 15c.
unpalatable (adj.)
1680s, from un- (1) "not" + palatable (adj.). Related: Unpalatably.
unparalleled (adj.)
1590s, from un- (1) "not" + past participle of parallel (v.). Unparallel as an adjective is recorded from 1650s.
unpardonable (adj.)
1520s, from un- (1) "not" + pardonable (adj.). Related: Unpardonably.
unpatriotic (adj.)
1775, from un- (1) "not" + patriotic.
unpaved (adj.)
1530s, from un- (1) "not" + past participle of pave (v.).
unpenetrable (adj.)
c.1400, from un- (1) "not" + penetrable (adj.). The usual word now is impenetrable.
unperceived (adj.)
mid-14c., from un- (1) "not" + past participle of perceive (v.).
unpersuasive (adj.)
1748, from un- (1) "not" + persuasive (adj.). Related: Unpersuasively.
unperturbed (adj.)
early 15c., from un- (1) "not" + past participle of perturb (v.).
unplace (v.)
from un- (2) "reverse, opposite of" + place (v.). Related: Unplaced; unplacing.
unplanned (adj.)
by 1804, from un- (1) "not" + past participle of plan (v.).