puritanical
Concise Oxford English Dictionary © 2008 Oxford University Press:
puritanical /pjʊərɪˈtanɪk(ə)l/
▶adjective having a very strict or censorious attitude towards self-indulgence or sex.
– derivatives
puritanically adverb.
puritanically adverb.
'puritanical' also found in these Oxford entries:

