noun
a person who tends to follow a theory or system without regard to practical considerations
adjective
adhering strictly to a theory or system without regard to practical considerations
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The politician's doctrinaire approach to policy alienated many potential supporters.
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She's so doctrinaire about following the rules, it's annoying.
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Don't be such a doctrinaire, just go with the flow.
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His doctrinaire mindset was like a brick wall, impossible to break through.