<p><strong>Noun:</strong></p><ul><li>A person who tries to apply some doctrine or theory without sufficient regard for practical considerations; an impractical theorist.</li></ul><p><strong>Adjective:</strong></p><ul><li>Dogmatic about others' acceptance of one's ideas; fanatical: a doctrinaire preacher.</li><li>Merely theoretical; impractical.</li><li>Of, relating to, or characteristic of a doctrinaire.</li></ul>