1) Abstainer 2) Ascetic 3) Exaggeratedly proper 4) Marked by stern morality 5) Morally rigorous and strict 6) Protestantism 7) Rigidly austere 1) Austere 2) Nonindulgent 3) Priggish 4) Prim 5) Prissy 6) Proper 7) Prudish 8) Puritan 9) Puritanic 10) Straightlaced 11) Strait-laced 12) Straitlaced 
• (a.) Precise in observance of legal or religious requirements; strict; overscrupulous; rigid; -- often used by way of reproach or contempt. • (a.) Of or pertaining to the Puritans, or to their doctrines and practice.
adjective of or relating to Puritans or Puritanism
very strict in moral or religious matters, often excessively so; rigidly austere. · (sometimes cap.) of, pertaining to, or characteristic of Puritans or Puritanism.