- unethical (adj.)
- 1871, from un- (1) "not" + ethical. Related: Unethically.
- uneventful (adj.)
- 1800, from un- (1) "not" + eventful. Related: Uneventfully.
- unfunny (adj.)
- 1858, from un- (1) "not" + funny (adj.).
- ungrammatical (adj.)
- 1650s, from un- (1) "not" + grammatical. Related: Ungrammatically.
- ungrateful (adj.)
- 1550s, from un- (1) "not" + grateful. Related: Ungratefully.
- unafraid (adj.)
- early 15c., from un- (1) "not" + afraid.
- underwater (adj.)
- 1620s, from under + water (n.1). Of mortgages from 2008.
- unclassified (adj.)
- 1813, from un- (1) "not" + past participle of classify.
- air freshener (n.)
- 1949, from air (n.1) + agent noun from freshen.
- anechoic (adj.)
- 1948, in electronics, from an- (1) "not" + echoic.
- attitudinal (adj.)
- 1831, from Italian attitudine (see attitude) + -al (1).
- breakwater (n.)
- 1721, from break (v.) + water (n.1).
- bogeyman (n.)
- 16c.; see bogey (n.1) + man (n.).
- vagal (adj.)
- "pertaining to the vagus," 1846, from vagus + -al (1).
- unbelievable (adj.)
- 1540s, from un- (1) "not" + believable. Related: Unbelievably.
- vocational (adj.)
- 1650s, from vocation + -al (1). Related: Vocationally.
- unalienable (adj.)
- 1610s, from un- (1) "not" + alienable. Related: Unalienably.
- unapologetic (adj.)
- 1834, from un- (1) "not" + apologetic. Related: Unapologetically.
- unceremonious (adj.)
- 1580s, from un- (1) "not" + ceremonious. Related: Unceremoniously.
- uncompassionate (adj.)
- 1590s, from un- (1) "not" + compassionate (adj.).
- uncongenial (adj.)
- 1749, from un- (1) "not" + congenial (adj.).
- unconquerable (adj.)
- 1590s, from un- (1) "not" + conquer + -able.
- unsanitary (adj.)
- 1871, from un- (1) "not" + sanitary (adj.).
- unsearchable (adj.)
- late 14c., from un- (1) "not" + searchable (adj.).
- unsubstantial (adj.)
- mid-15c., from un- (1) "not" + substantial (adj.).
- unsustainable (adj.)
- 1670s, from un- (1) "not" + sustainable (adj.).
- unsympathetic (adj.)
- 1785, from un- (1) "not" + sympathetic (adj.).
- unsystematic (adj.)
- 1770, from un- (1) "not" + systematic (adj.).
- untangible (adj.)
- 1775, from un- (1) "not" + tangible (adj.).
- unusable (adj.)
- 1825, from un- (1) "not" + usable (adj.).
- undeviating (adj.)
- 1732, from un- (1) "not" + present participle of deviate.
- unendurable (adj.)
- 1620s, from un- (1) "not" + endurable. Related: Unendurably.
- unjustifiable (adj.)
- 1640s, from un- (1) "not" + justifiable. Related: Unjustifiably.
- unimaginable (adj.)
- 1610s, from un- (1) "not" + imaginable. Related: Unimaginably.
- unmindful (adj.)
- late 14c., from un- (1) "not" + mindful (adj.).
- unprepossessing (adj.)
- 1816, from un- (1) "not" + prepossessing (adj.).
- unpunctual (adj.)
- 1740, from un- (1) "not" + punctual (adj.).
- unreachable (adj.)
- 1590s, from un- (1) "not" + reachable (adj.).
- unrealistic (adj.)
- 1865, from un- (1) "not" + realistic. Related: Unrealistically.
- yucky (adj.)
- 1970, from yuck (1) + -y (2). Related: Yuckiness.
- genitival (adj.)
- 1818, from genitive + -al (1). Related: Genitivally.
- gestational (adj.)
- 1970, from gestation + -al (1). Related: Gestationally.
- gestural (adj.)
- 1610s, from gesture (n.) + -al (1). Related: Gesturally.
- fog-horn (n.)
- 1844, from fog (n.1) + horn (n.).
- barbell (n.)
- 1887, from bar (n.1) + ending from dumbbell.
- actuarial (adj.)
- 1853, from actuary + -al (1). Related: Actuarially.
- gallstone (n.)
- 1758, from gall (n.1) + stone (n.).
- gluteal (adj.)
- also glutaeal, by 1804, from gluteus + -al (1).
- striper (n.)
- "striped bass," 1945, from stripe (n.1).
- confrontational (adj.)
- 1969, from confrontation + -al (1). Related: Confrontationally.
