puritanical

Short definition from Wiktionary

Adjective

1. 1
   Of or pertaining to the Puritans, or to their doctrines and practice.
2. 2
   Precise in observance of legal or religious requirements; strict; overscrupulous; rigid (often used by way of reproach or contempt).
3. 3
   Alternative letter-case form of puritanical.

Noun

1. 1
   One who holds puritanical attitudes.