Online Etymology Dictionary

undisputable (adj.): 1590s, from un- (1) "not" + disputable (see dispute (v.)). The usual word is indisputable. Related: Undisputably.
unexcusable (adj.): late 14c., from un- (1) "not" + excusable. The usual word is inexcusable. Related: Unexcusably.
unhuman (adj.): 1540s, "inhumane, cruel," from un- (1) "not" + human (adj.). Meaning "destitute of human qualities; superhuman" is from 1782.
unpenetrable (adj.): c. 1400, from un- (1) "not" + penetrable (adj.). The usual word now is impenetrable.
unquenchable (adj.): late 14c., of fire; 1560s, of thirst, from un- (1) "not" + quench (v.) + -able. Related: Unquenchably.
watertight (adj.): also water-tight, late 14c., from water (n.1) + tight (adj.). Figurative use from 1640s.
widen (v.): c. 1600 (transitive), from wide + -en (1). Intransitive sense from 1709. Related: Widened; widening.
windrow (n.): 1520s, from wind (n.1) + row (n.). Because it is exposed to the wind for drying.
windward (adj.): "on the side toward which the wind blows," 1540s, from wind (n.1) + -ward.
aeration (n.): 1570s, from French aération, from aérer (v.), from Latin aer (see air (n.1)). In some cases, from aerate.
pot-holder (n.): also potholder, the cloth variety so called by 1902, from pot (n.1) + holder.
fretwork (n.): also fret-work, "ornamental work consisting of frets," c. 1600, from fret (n.1) + work (n.).
gladsome (adj.): late 14c., gladsum "glad, joyful, cheerful;" see glad (adj.) + -some (1).
giglot (n.): "lewd, wanton woman" (mid-14c.); later "a giddy, romping girl;" of unknown origin; compare gig (n.1).
gladiatorial (adj.): 1712, from Latin gladiatorius (see gladiator) + -al (1). Earlier was gladiatory (c. 1600), from French gladiatoire, from Latin gladiatorius.
glottal (adj.): 1846, "pertaining to or formed by the glottis;" see glottis + -al (1). Glossal is attested from 1860.
fly-over (n.): also flyover, 1901 of bridges, 1931, of aircraft flights, from fly (v.1) + over (adv.).
airship (n.): also air-ship, 1888, translating German Luftschiff "motor-driver dirigible;" see air (n.1) + ship (n.).
grazier (n.): "one who pastures cattle for market," late 13c. as a surname, agent noun from graze (v.1).
gummy (adj.): "gum-like, sticky," late 14c., from gum (n.1) + -y (2). Related: Gumminess.
heel (v.1): of a dog, "to follow or stop at a person's heels," 1810, from heel (n.1). Also see heeled.
hipped (adj.): "having hips," c. 1500, past participle adjective; see hip (n.1)). In architecture (of roofs) from 1785.
hood (v.): c. 1200, "to put a hood on;" c. 1400, "to furnish with a hood," from hood (n.1). Related: Hooded; hooding.
anencephalic (adj.): "having no brain" (biology), 1839, from Greek anenkephalos, from privative prefix an- (see an- (1)) + enkephalos "brain" (see encephalitis) + -ic.
Areopagite (n.): "member of the Areopagus court," late 14c.; see Areopagus + -ite (1). See Acts xvii:34.
arithmetical (adj.): 1540s; see arithmetic + -al (1). Related: Arithmetically (late 15c.). In modern use, opposed to geometrical.
homo- (2): word-forming element meaning "homosexual," abstracted since early 20c. from homosexual, and ultimately identical to homo- (1).
misbefall (v.): "suffer harm, come to grief," mid-13c., from mis- (1) + befall. Related: Misbefell; misbefalling.
horse-race (n.): also horserace, 1580s, from horse (n.) + race (n.1). Related: Horse-racing.
hardball (n.): 1883 as the name of a game, from hard (adj.) + ball (n.1). The figurative sense of "tough, uncompromising behavior" is from 1973.
unadvertised (adj.): mid-15c., "uninformed, unadvised," from un- (1) + advertised. Sense of "not announced or made known" is from 1864.
unashamed (adj.): c. 1500, implied in unashamedness, from un- (1) "not" + ashamed. Related: Unashamedly.
inappropriate (adj.): 1791, from in- (1) "not, opposite of" + appropriate (adj.). Related: Inappropriately; inappropriateness. Unappropriate is from 1742.
diabolical (adj.): c. 1500, "pertaining to the devil," from diabolic + -al (1). Meaning "befitting the devil" is from 1540s. Related: Diabolically.
earshot (n.): also ear-shot, c. 1600, from ear (n.1) + shot (n.) in the sense of "range" (as in bowshot).
inconsequential (adj.): 1620s, "characterized by inconsequence;" 1782, "not worth noticing;" see inconsequent + -al (1). Related: Inconsequentially.
indecisive (adj.): 1726, "inconclusive," from in- (1) "not, opposite of" + decisive. Meaning "vacillating, characterized by indecision" is from 1775. Related: Indecisively; indecisiveness.
insubordination (n.): 1790, on the model of French insubordination (1775); from in- (1) "not, opposite of" + subordination.
judgmental (adj.): 1873, "involving the exercise of judgment," from judgment + -al (1). Meaning "inclined to make moral judgments" is attested from 1952. Related: Judgmentally.
loathsome (adj.): c. 1300, "foul, detestable," from loath in its older, stronger sense + -some (1). Related: Loathsomely; loathsomeness.
quintessential (adj.): c. 1600, "purest, most refined," from quintessence (Medieval Latin quint essentia) + -al (1). Related: Quintessentially.
satirical (adj.): 1520s, from Late Latin satiricus, from Latin satira "satire, poetic medley" (see satire (n.)) + -al (1). Related: Satirically.
sexpot (n.): "erotically willing and desirable female," 1929, from sex (n.) + pot (n.1), perhaps suggested by fleshpot.
detonator (n.): 1822, agent noun in Latin form from detonate. For suffix, see -er (1).
developmental (adj.): 1830, from development + -al (1). Developmentalist (1862) was a word for "follower of the theory of evolution."
devotional (adj.): 1640s; see devotion + -al (1). The noun meaning "devotional composition" is recorded from 1650s.
frogman (n.): "scuba diver in rubber suit," 1945, from frog (n.1) + man (n.).
froggy (adj.): 1610s, "full of frogs," from frog (n.1) + -y (2). Meaning "frog-like" is from 1837. Related: Frogginess.
bulldog (n.): c. 1500, from bull (n.1) + dog (n.). Perhaps from shape, perhaps because originally used for baiting bulls.
fictional (adj.): "pertaining to fiction," 1833, from fiction + -al (1). Earlier fictitious also was used in this sense (1773).