(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.

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