doc ‧ tri ‧ naire /ˌdɒktrəˈneə◂, ˌdɒktrɪˈneə◂ $ ˌdɑːktrəˈner◂/ BrE AmE adjective formal
certain that your beliefs or opinions are correct and unwilling to change them:
The party followed an increasingly doctrinaire course.
doc ‧ tri ‧ naire /ˌdɒktrəˈneə◂, ˌdɒktrɪˈneə◂ $ ˌdɑːktrəˈner◂/ BrE AmE adjective formal
certain that your beliefs or opinions are correct and unwilling to change them:
The party followed an increasingly doctrinaire course.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012