Online Etymology Dictionary

unenlightened (adj.): 1660s, "not lit up," from un- (1) "not" + past participle of enlighten (v.). Meaning "not mentally illuminated" is attested from 1650s.
unfailing (adj.): late 14c., "never coming to an end, unceasing, everlasting, inexhaustible," from un- (1) "not" + present participle of fail (v.). Related: Unfailingly.
unfashionable (adj.): 1560s, "incapable of being shaped," from un- (1) "not" + fashionable. Meaning "not in accordance with prevailing fashion" is attested from 1640s. Related: Unfashionably.
unfathomable (adj.): 1610s, originally in the figurative sense, of feelings, conditions, etc., from un- (1) "not" + fathomable. Literal sense attested from 1670s. Related: Unfathomably.
unforeseen (adj.): late 14c., from un- (1) "not" + past participle of foresee. Similar formation in Middle Dutch onvoresien, Dutch onvoorzien, Middle High German unvorsen.
unfruitful (adj.): late 14c., "barren," from un- (1) "not" + fruitful. Originally literal; figurative sense is attested from c. 1400. Related: Unfruitfully; unfruitfulness.
unguarded (adj.): 1590s, "not furnished with a guard," from un- (1) "not" + guarded. Sense of "not on one's guard, not taking heed" is attested from 1630s.
unhealthy (adj.): 1590s, "injurious to health," from un- (1) "not" + healthy (adj.). Earlier unhealthsome (1540s), unhealthful (1570s). Of persons, "sickly," it is attested from 1610s. Related: Unhealthily.
unbiased (adj.): c. 1600, literal, in reference to throws at bowls, from un- (1) "not" + biased. Figurative sense of "impartial, unprejudiced" is recorded from 1640s.
unbalanced (adj.): 1640s, from un- (1) "not" + past participle of balance (v.). Earliest use is in reference to the mind, judgment, etc. Of material things, it is recorded from 1732.
unavailable (adj.): 1540s, "ineffectual," from un- (1) "not" + available. Meaning "incapable of being used" is recorded from 1855. Unavailing has taken up the older sense of the word.
unaccountable (adj.): 1640s, "inexplicable," from un- (1) "not" + accountable. Meaning "not liable to be called to account" is recorded from 1640s. Related: Unaccountably; unaccountability; unaccountableness.
unable (adj.): late 14c., "lacking in ability, incapable," from un- (1) "not" + able (adj.). Modeled on Old French inhabile or Latin inhabilis.
undignified (adj.): 1680s, of clergy, "not holding a position of dignity," from un- (1) "not" + dignified. Meaning "lacking in dignity of manner" is attested from 1782.
undisputed (adj.): 1560s, "not argued with," from un- (1) "not" + past participle of dispute (v.). Meaning "not called into question" is attested from 1620s.
undying (adj.): c. 1300, "immortal," from un- (1) "not" + present participle of die (v.). Figurative sense, of feelings, etc., is recorded from c. 1765.
uneasy (adj.): late 13c., "not comforting, causing trouble," from un- (1) "not" + easy (adj.). Meaning "disturbed in mind" is attested from 1670s. Related: Uneasily; uneasiness.
unconfirmed (adj.): 1560s, "not having received the rite of confirmation," from un- (1) "not" + confirmed. Meaning "not supported by further evidence" is attested from 1670s.
uncompensated (adj.): 1774, "not compensated by any good," from un- (1) "not" + past participle of compensate (v.). Meaning "not recompensed" is attested from 1830.
uncommon (adj.): 1540s, "not possessed in common," from un- (1) "not" + common (adj.). Meaning "not commonly occurring, unusual, rare" is recorded from 1610s. Related: Uncommonly.
uncommitted (adj.): late 14c., "not delegated," from un- (1) "not" + committed. Meaning "not pledged to any particular course or party" is attested from 1814.
unchristian (adj.): 1550s, "not professing Christianity" (of persons), from un- (1) "not" + Christian (adj.). Meaning "at variance with Christian principles" (of actions) is recorded from 1580s.
anywhere (adv.): late 14c., from any + where. Earlier words in this sense were owhere, oughwhere, aywhere, literally "aught where" (see aught (1)).
armilla (n.): 1706, Latin, literally "bracelet, armlet, arm ring," from armus "shoulder, upper arm" (see arm (n.1)). Related: Armillary.
airtight (adj.): also air-tight, "impervious to air," 1760, from air (n.1) + tight. Figurative sense of "incontrovertible" (of arguments, alabis, etc.) is from 1929.
amaranthine (adj.): 1660s, "unfading, undying," poetic (apparently coined by Milton), also amarantine; see amaranth + -ine (1). Later used of a purple color.
anoxic (adj.): 1920, Modern Latin, from Greek an-, privative prefix, "not, without" (see an- (1)) + first two letters of oxygen + -ic. Anoxia "oxygen deficiency" is attested from 1931.
sateen (n.): "glossy cloth resembling satin," 1835, variant of satin (q.v.), perhaps influenced by velveteen, where the ending is a variant of -ine (1).
surtax (n.): "extra tax," 1834, from French surtaxe, from Old French sur- "over" (see sur- (1)) + taxe "tax" (see tax (n.)).
scrappy (adj.): "consisting of scraps," 1837, from scrap (n.1) + -y (2). Meaning "inclined to fight" (1895) is from scrap (v.2). Related: Scrappily; scrappiness.
semicolon (n.): punctuation-mark, 1640s, a hybrid coined from Latin-derived semi- + Greek-based colon (n.1). The mark itself was (and is) in Greek the point of interrogation.
atop (adv.): 1650s, from a- (1) + top. Two words or hyphenated at first; not fully established as one word till late 19c.
capitalize (v.): "write or print in capital letters," 1764, from capital (n.1) + -ize. Meaning "to convert (assets) to capital" is recorded from 1868. Related: Capitalized; capitalizing.
capitalism (n.): 1854, "condition of having capital;" from capital (n.1) + -ism. Meaning "political/economic system which encourages capitalists" is recorded from 1872.
bilirubin (n.): "reddish pigment found in bile," 1871, from German bilirubin (1864), from bili- (see bile) + Latin ruber "red" (see red (1)) + -ine (2).
blackboard (n.): 1823, from black + board (n.1). Blackboard jungle "inner-city school rife with juvenile delinquency" is from Evan Hunter's novel title (1954).
brutal (adj.): mid-15c., in reference to the nature of animals, from Latin brutus (see brute (adj.)) + -al (1). Of persons, "fierce," 1640s. Related: Brutally.
bleu: French form of blue (1), used from c. 1890 in names of various French blue cheeses (French fromage bleu) marketed in Britain and U.S.
bodily (adj.): c. 1300, "pertaining to the body;" also opposed to "spiritual;" from body + -ly (1). As an adverb (with -ly (2)) from late 14c.
bookmark (n.): also book-mark, 1840, from book (n.) + mark (n.1). Bookmarker is older (1838). As a verb, by 1900. Related: Bookmarked; bookmarking.
varices (n.): plural of varix "dilated vein" (c. 1400), from PIE root *wer- (1) "high raised spot or other bodily infirmity" (see vary (v.)).
windbreaker (n.): type of jacket to keep off the wind (originally a kind of leather shirt), 1918, from wind (n.1) + agent noun from break (v.).
ultrasound (adj.): 1911, from ultra- + sound (n.1). Compare ultrasonic. In reference to ultrasonic techniques of detection or diagnosis it is recorded from 1958.
unattended (adj.): c. 1600, "alone, unaccompanied," from un- (1) "not" + past participle of attend (v.). Meaning "with no one in attendance" is from 1796.
uncontrollable (adj.): 1570s, "irrefutable," from un- (1) "not" + controllable. From 1590s as "not subject to authority;" meaning "that cannot be restrained" is from 1640s. Related: Uncontrollably.
unreserved (adj.): 1530s, "not restricted or withheld," from un- (1) "not" + past participle of reserve (v.). From 1713 as "open, frank." Related: Unreservedly.
unkept (adj.): mid-14c., "neglected," from un- (1) "not" + past participle of keep (v.). From late 14c. as "disregarded;" 1842 as "not stored or retained."
untitled (adj.): 1610s, "unnamed," from un- (1) "not" + past participle of title (v.). Meaning "having no right" is from 1660s; that of "undistinguished by an aristocratic title" is from 1798.
toilsome (adj.): 1580s, from toil (v.) + -some (1). An earlier word was toilous (early 15c.). The opposite, toilless (c. 1600) is much less common.
vinculum (n.): plural vincula, "a bond, tie," 1670s, from Latin vinculum "that with which anything is bound," from stem of vincire "to bind" (see wind (v.1)).