Synonyms for prudish

overnice, stilted, mincing, precise, narrow-minded, illiberal, bigoted, prissy, priggish, over-refined, fastidious, stuffy, conventional, offish, stiff, smug, strait-laced, demure, narrow, puritanical, blue-nosed*, affected, artificial, scrupulous, overexact, pedantic, pretentious, strict, rigid, rigorous, simpering, finical, finicking, finicky, squeamish, schoolgirlish, oldmaidish, like a maiden aunt, prudish as an old maid; see also prim.

Antonyms sociable*, broad-minded, genial.