c. 1300, "sexual intercourse;" mid-14c., "lasciviousness, sinful self-indulgence;" late 14c., "sensual pleasure," from Old French luxurie "debauchery, dissoluteness, lust" (12c., Modern French luxure), from Latin luxuria "excess, extravagant living, profusion; delicacy" (source also of Spanish lujuria, Italian lussuria), from luxus "excess, extravagance; magnificence," probably a figurative use of luxus (adj.) "dislocated," which is related to luctari "wrestle, strain" (see reluctance).
The English word lost its pejorative taint 17c. Meaning "habit of indulgence in what is choice or costly" is from 1630s; that of "sumptuous surroundings" is from 1704; that of "something choice or comfortable beyond life's necessities" is from 1780. Used as an adjective from 1916.
In Lat. and in the Rom. langs. the word connotes vicious indulgence, the neutral sense of the Eng. 'luxury' being expressed by L. luxus, F. luxe, Sp. lujo, It. lusso. [OED]
early 15c. (Chauliac), "reddish, flushed," especially of the face, especially as a result of indulgence in appetites, from Old French rubicond (14c.) and directly from Latin rubicundus, from rubere "to be red," from ruber "red" (from PIE root *reudh- "red, ruddy"). Related: Rubicundity.
"lustful man, man given to excessive sexual indulgence," late 12c., from Old French lecheor (Modern French lécheur) "one living a life of debauchery," especially "one given to sexual indulgence," literally "licker," agent noun from lechier "to lick;" also "to live in debauchery or gluttony," from Frankish *likkon or some other Germanic source, from Proto-Germanic *likkojan "to lick" (from PIE root *leigh- "to lick"). The Old French feminine form was lechiere. Middle English, meanwhile, had lickestre "female who licks;" figuratively "a pleasure seeker," literally "lickster," with -ster. In 18c. sometimes leacher (Bailey), along with leacherous, leachery.
"habitually lewd or profligate person, one addicted to vicious indulgence in sensual pleasures," 1660s, from French débauché "debauched (person)," noun use of past participle of debaucher (see debauch).
Debauchee, n. One who has so earnestly pursued pleasure that he has had the misfortune to overtake it. [Ambrose Bierce, "Devil's Dictionary," 1911]