very strict in moral or religious matters, often excessively so; rigidly austere.
(sometimes initial capital letter) of, pertaining to, or characteristic of Puritans or Puritanism.
Also, puritanic.

1600–10; Puritan + -ical

puritanically, adverb
puritanicalness, noun
unpuritanic, adjective
unpuritanical, adjective
unpuritanically, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
puritanical or puritanic (ˌpjʊərɪˈtænɪkəl)
1.  derogatory usually strict in moral or religious outlook, esp in shunning sensual pleasures
2.  (sometimes capital) of or relating to a puritan or the Puritans
puritanic or puritanic
puri'tanically or puritanic
puri'tanicalness or puritanic

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The new book addresses at length the game's outlaw cachet, as well as its stink
  in some of our more puritanical noses.
In our puritanical culture, you're supposed to suffer for your fun.
It's shamelessly permissive or tenaciously puritanical.
Some are confined simply because their frightened puritanical families consider
  them too unruly.
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