Puritan – strict in moral or religious matters (based on a group of protestants in the 16th/17th century who called for worship to be simplified and regulated)
"Only pure words should be written (puritan) down" said the headmaster, he was strict in moral and religious matters.
Examples of puritan in a sentence
He was a devoted puritan and had never deviated, even slightly, from any of his religion's rules.
Everyone called him the office's puritan, because of how strictly he followed the rules at work.
Her puritan parents were incredibly strict, which is why she couldn't wait to move out.