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]