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delicacy (n.)[delicacy 词源字典]: late 14c., "delightfulness; fastidiousness; quality of being addicted to sensuous pleasure," from delicate + -cy. Meaning "fineness, softness, tender loveliness" is from 1580s; that of "weakness of constitution" is from 1630s. Meaning "fine food, a dainty viand" is from early 15c.[delicacy etymology, delicacy origin, 英语词源]
fastidious (adj.): mid-15c., "full of pride," from Latin fastidiosus "disdainful, squeamish, exacting," from fastidium "loathing, squeamishness; dislike, aversion; excessive nicety," which is of uncertain origin; perhaps from *fastu-taidiom, a compound of fastus "contempt, arrogance, pride," and taedium "aversion, disgust." Fastus is possibly from PIE *bhars- (1) "projection, bristle, point," on the notion of "prickliness" (Watkins) or "a semantic shift from 'top' to 'haughtiness' which is conceivable, but the u-stem is not attested independently" [de Vaan], who adds that "fastidium would be a tautology." Early use in English was both in passive and active senses. Meaning "squeamish, over-nice" in English emerged 1610s. Related: Fastidiously; fastidiousness.
Jemmy: a popular pet form of the masc. proper name James (in Middle English records, Gemme, Jemme are more common than Jimme). In mid-18c. often associated with effeminacy and male fastidiousness. As "a crowbar" from 1811.