Old English heard "solid and firm, not soft," also, "difficult to endure, carried on with great exertion," also, of persons, "severe, rigorous, harsh, cruel," from Proto-Germanic *hardu- (source also of Old Saxon hard, Old Frisian herd, Dutch hard, Old Norse harðr "hard," Old High German harto "extremely, very," German hart, Gothic hardus "hard"), from PIE *kortu-, suffixed form of root *kar- "hard."
Meaning "difficult to do" is from c. 1200. Of water, in reference to the presence of mineral salts, 1650s; of consonants, 1775. Hard of hearing preserves obsolete Middle English sense of "having difficulty in doing something." In the sense "strong, spiritous, fermented" from 1789 (as in hard cider, etc.), and this use probably is the origin of that in hard drugs (1955). Hard facts is from 1853; hard news in journalism is from 1918. Hard copy (as opposed to computer record) is from 1964; hard disk is from 1978; the computer hard drive is from 1983. Hard times "period of poverty" is from 1705. Hard money (1706) is specie, silver or gold coin, as opposed to paper. Hence 19c. U.S. hard (n.) "one who advocates the use of metallic money as the national currency" (1844). To play hard to get is from 1945. Hard rock as a pop music style recorded from 1967. To do something the hard way is from 1907.
"in a state of decline or decay (from a former condition of excellence)," 1837 (Carlyle), from French décadent, back-formation from décadence (see decadence). In reference to literary (later, other artistic) schools that believed, or affected to believe, they lived in an age of artistic decadence, 1885 in French, 1888 in English. Usually in a bad sense:
Bread, supposedly the staff of life, has become one of our most decadent foods — doughy, gummy, and without the aroma, flavor, texture, taste and appearance that is typical of good bread. ["College and University Business" 1960]
Beckoning sense of "desirable and satisfying to self-indulgence" begins c. 1970 in commercial publications in reference to desserts.
As a noun, "one whose artistic or literary work is supposed to show marks of decadence," 1889 (from 1887 as a French word in English), originally in a French context.
On the subject of poetry I am bound to signalize one of those grotesque, unexpected apparitions which would appear to be constitutional to our country [i.e. France] .... I refer to the recent appearance of a literary clique of madmen or idlers, the self-named décadents. I own I am almost ashamed to occupy your time with this unworthy subject, which I should not have thought fit to introduce had not our newspapers and even our reviews taken the décadents to task, and were it not that they have furnished chroniqueurs short of copy with matter for articles, and that the serious Temps itself has taken up their trashy nonsense. [The Athenaeum, Jan. 1, 1887]
early 13c., "skill as a result of learning or practice," from Old French art (10c.), from Latin artem (nominative ars) "work of art; practical skill; a business, craft," from PIE *ar(ə)-ti- (source also of Sanskrit rtih "manner, mode;" Greek artizein "to prepare"), suffixed form of root *ar- "to fit together." Etymologically akin to Latin arma "weapons."
In Middle English usually with a sense of "skill in scholarship and learning" (c. 1300), especially in the seven sciences, or liberal arts. This sense remains in Bachelor of Arts, etc. Meaning "human workmanship" (as opposed to nature) is from late 14c. Meaning "system of rules and traditions for performing certain actions" is from late 15c. Sense of "skill in cunning and trickery" first attested late 16c. (the sense in artful, artless). Meaning "skill in creative arts" is first recorded 1610s; especially of painting, sculpture, etc., from 1660s.
In science you must not talk before you know. In art you must not talk before you do. In literature you must not talk before you think. [Ruskin, "The Eagle's Nest," 1872]
Supreme art is a traditional statement of certain heroic and religious truths, passed on from age to age, modified by individual genius, but never abandoned. The revolt of individualism came because the tradition had become degraded, or rather because a spurious copy had been accepted in its stead. [William Butler Yeats, journal, 1909]
Expression art for art's sake (1824) translates French l'art pour l'art. First record of art critic is from 1847. Arts and crafts "decorative design and handcraft" first attested in the Arts and Crafts Exhibition Society, founded in London, 1888.
"of the color of the clear sky," c. 1300, bleu, blwe, etc., "sky-colored," also "livid, lead-colored," from Old French blo, bleu "pale, pallid, wan, light-colored; blond; discolored; blue, blue-gray," from Frankish *blao or some other Germanic source, from Proto-Germanic *blæwaz (source also of Old English blaw, Old Saxon and Old High German blao, Danish blaa, Swedish blå, Old Frisian blau, Middle Dutch bla, Dutch blauw, German blau "blue").
This is from PIE *bhle-was "light-colored, blue, blond, yellow," from root *bhel- (1) "to shine, flash, burn," also "shining white" and forming words for bright colors. The same PIE root yielded Latin flavus "yellow," Old Spanish blavo "yellowish-gray," Greek phalos "white," Welsh blawr "gray," showing the slipperiness of definition in Indo-European color-words. Many Indo-European languages seem to have had a word to describe the color of the sea, encompassing blue and green and gray; such as Irish glass (from PIE root *ghel- (2) "to shine,"); Old English hæwen "blue, gray," related to har (see hoar); Serbo-Croatian sinji "gray-blue, sea-green;" Lithuanian šyvas, Russian sivyj "gray."
The present spelling in English is since 16c., common from c. 1700. The sense "lead-colored, blackish-blue, darkened as if by bruising" is perhaps by way of the Old Norse cognate bla "livid, lead-colored." It is the meaning in black and blue, and blue in the face "livid with effort" (1864, earlier black and blue in the face, 1829).
The color of constancy since Chaucer at least, but apparently for no deeper reason than the rhyme in true blue (c. 1500). Figurative meaning "sad, sorrowful, afflicted with low spirits" is from c. 1400, perhaps from the "livid" sense and implying a bruised heart or feelings. Of women, "learned, pedantic," by 1788 (see bluestocking). In some phrases, such as blue murder, it appears to be merely intensive.
Blue pencil as an editor's characteristic tool to mark corrections in copy is from 1885; also as a verb from 1885. The fabulous story of Blue-beard, who kept his murdered wives in a locked room, is from 1798. For blue ribbon see cordon bleu under cordon. Blue whale attested from 1851, so called for its color. Blue cheese is from 1862. Blue water "the open ocean" is from 1822. Blue streak, of something resembling a bolt of lightning (for quickness, intensity, etc.) is from 1830, Kentucky slang. Delaware has been the Blue Hen State at least since 1830, supposedly from a nickname of its regiments in the Revolutionary War.
The exact color to which the Gmc. term applies varies in the older dialects; M.H.G. bla is also 'yellow,' whereas the Scandinavian words may refer esp. to a deep, swarthy black, e.g. O.N. blamaðr, N.Icel. blamaður 'Negro' [Buck]
Few words enter more largely into the composition of slang, and colloquialisms bordering on slang, than does the word BLUE. Expressive alike of the utmost contempt, as of all that men hold dearest and love best, its manifold combinations, in ever varying shades of meaning, greet the philologist at every turn. [John S. Farmer, "Slang and Its Analogues Past and Present," 1890, p.252]