Perfectionist(n.) One pretending to perfection; esp., one pretending to moral perfection; one who believes that persons may and do attain to moral perfection and sinlessness in this life.
Thesaurus Entries
Babbitt, Leibnizian, Leibnizian optimist, Middle American, Philistine, Pollyanna, anal character, aspirant, aspirer, bourgeois, bright, burgher, captious critic, censorious, cheerful, chiliast, chiliastic, choicy, choosy, compulsive character, conformer, conformist, conscientious, conventionalist, couleur de rose, critical, demanding, discriminating, discriminative, exacting, fastidious, formalist, fuss-budget, fusspot, fussy, hopeful, hoper, irrepressible optimist, methodologist, meticulous, middle-class type, millenarian, millennialist, millennialistic, millennian, model child, nit-picking, nitpicker, obsessive, optimist, optimistic, organization man, parrot, particular, pedant, perfectibilist, perfectibilitarian, perfectionistic, philosophical optimist, picky, plastic person, precise, precisian, precisianist, precisianistic, precisionist, priggish, prudish, punctilious, purist, puristic, puritanic, ray of sunshine, rose-colored, roseate, rosy, scrupulous, selective, sensitive, sheep, square, stickler, strict, sunny, teenybopper, trimmer, upbeat, utopian, yes-man