puritan

adjective1

1. •
   Acting or behaving according to the Puritan morals (e.g. propagating modesty), especially with regard to pleasure, nudity and sex; ascetic.

   • A pietistic protestantism, rigid, self-righteous, unintellectual, obsessed with puritan morality to the point where hypocrisy was its automatic companion, dominated this desolate epoch. — 1962

noun1

1. •
   A puritanical person.

noun1

1. •
   A member of a particular Protestant religious sect advocating greater purity and piety.