doctrinaire
Concise Oxford English Dictionary © 2008 Oxford University Press:
doctrinaire /ˌdɒktrɪˈnɛː/
▶adjective seeking to impose a doctrine in all circumstances without regard to practical considerations. ▶noun a doctrinaire person.
– derivatives
doctrinairism noun.
doctrinairism noun.
'doctrinaire' also found in these Oxford entries:

