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

---

noun

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

Other Word Forms

• doctrinairism noun
• doctrinarian noun
• nondoctrinaire adjective
• overdoctrinaire adjective
• undoctrinaire adjective

Etymology

Origin of doctrinaire

From French, dating back to 1810–20; 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.

Example Sentences

“Despite all evidence to the contrary, Marshall still believed,” in Mr. Dikötter’s words, that the Communists “were not doctrinaire ideologists, but merely rural reformers who could help shape a democratic China.”

From The Wall Street Journal • Feb. 13, 2026

"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

But the idea is first stolen by one of her colleagues, then shot down by another as insufficiently doctrinaire.

From New York Times • Mar. 21, 2024

But in the latter case, she writes on political philosophy like a statesman—in the former there is much of the doctrinaire.

From Harriet Martineau by Miller, Florence Fenwick