Rigidly committed to a doctrine or theory without regard for practical considerations; inflexibly ideological and unwilling to compromise on principles.
From French 'doctrinaire,' from 'doctrine' plus the suffix '-aire.' Originally referred to a French political party that rigidly followed constitutional monarchy theory, later generalized to describe any inflexible adherence to doctrine.
Think 'doctrine-aire'—someone who puts doctrine in the 'air' above everything else! A doctrinaire person breathes theory but can't see practical reality—they're so high up in their principles they've lost touch with the ground.
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