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doctrinaire

American  
[dok-truh-nair] / ˈdɒk trəˈnɛər /

noun

  1. a person who tries to apply some doctrine or theory without sufficient regard for practical considerations; an impractical theorist.


adjective

  1. dogmatic about others' acceptance of one's ideas; fanatical.

    a doctrinaire preacher.

    Synonyms:
    unyielding, inflexible, uncompromising, authoritarian
    Antonyms:
    flexible, reasonable
  2. merely theoretical; impractical.

  3. of, relating to, or characteristic of a doctrinaire.

doctrinaire British  
/ ˌdɒktrɪˈnɛə /

adjective

  1. stubbornly insistent on the observation of the niceties of a theory, esp without regard to practicality, suitability, etc

  2. theoretical; impractical

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

noun

  1. a person who stubbornly attempts to apply a theory without regard to practical difficulties

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Etymology

Origin of doctrinaire

From French, dating back to 1810–20; see origin at doctrine, -aire

Explanation

You've doubtless met someone doctrinaire at some point. You know them by their complete unwillingness to accept any belief other than their own. If you're familiar with the noun "doctrine" — a formal idea or system of belief — you'll have no problem with the adjective doctrinaire. It's a just a way of describing a person or group of people who are set in their ways. Parents can start out doctrinaire, but children soon force them to be flexible in how they bring them up.

Keep Reading on Vocabulary.com

Vocabulary lists containing doctrinaire

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A fun game to play is to ask your most politically doctrinaire friends if there’s a policy they secretly support that cuts against their usual views.

From The Wall Street Journal • Oct. 21, 2025

"The modernism that was around before the 1980s was very grey, restrictive, utilitarian and quite doctrinaire really," Farrell said.

From BBC • Sep. 29, 2025

His harping on this point could come across as doctrinaire.

From Los Angeles Times • Feb. 14, 2025

Other judges are not so clinical or doctrinaire about it.

From Salon • Feb. 2, 2024

The founder of it was not a "doctrinaire," but a philanthropist on ideal principles.

From Transcendentalism in New England A History by Frothingham, Octavius Brooks