doctrinairism (ˌdoctriˈnairism) or doctrinarism (ˌdoctriˈnarism)noundoctrinarian (ˌdoctriˈnarian)noun
doctrinaire for learners of English
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graded adjective & adjective
If you say that someone is doctrinaire or has a doctrinaireattitude, you disapprove of them because they have fixed principles which they try to force on other people. [formal, disapproval] ⇒ He is firm but not doctrinaire.