adjective

seeking to impose a doctrine in all circumstances without regard to practical considerations.

the administration’s doctrinaire economic policy

dogmatic,rigid,inflexible,uncompromising,unyielding,holding fixed views,adamant,insistent,pontifical,authoritarian,domineering,opinionated,intolerant,biased,prejudiced,fanatical,zealous,extreme,swivel-eyed

noun

a doctrinaire person.