/ ˌdɒktrɪˈneə(r); NAmE ˌdɑːktrəˈner/ adjective
( disapproving ) strictly following a theory in all circumstances, even if there are practical problems or disagreement :
a doctrinaire communist
doctrinaire attitudes / beliefs / policies
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WORD ORIGIN
early 19th cent.: from French , from doctrine , from Latin doctrina teaching, learning, from doctor teacher, from docere teach.