(of) a person who (often for religious reasons) leads a very simple life without pleasures

self-denying

neat; formal; (of a person, manner, speech etc) showing dislike of anything rough, rude, improper

particular, fussy

easily shocked; extremely (often too) moral

shy and strict in behavior

(too) easily made sick; feeling sick; (too) easily disgusted or shocked

nauseated; finicky

(of a person) too strict, conservative, serious

prudish

very serious about good behaviour; clear and exact

authoritarian