The word for today is…
doctrinaire (adjective, noun):
adjective
: stubbornly or excessively devoted to a doctrine or theory without regard to practical considerations
noun
: one who attempts to put into effect an abstract doctrine or theory with little or no regard for practical difficulties
Source : Merriam -Webster
Etymology : The noun doctrine refers to a set of ideas or beliefs that are taught or believed to be true, and is often used specifically for the principles on which a government or religion may be based. Its adjectival form, doctrinal (“of, relating, or preoccupied with doctrine”), as in “doctrinal teachings,” is straightforward and not particularly judgmental. Doctrinaire, however, describes someone who is rigidly and impractically devoted to a doctrine. This critical connotation comes from the word’s history in post-revolutionary France as a name for members of a group of constitutional monarchists led by statesman and philosopher Pierre Paul Royer-Collard. Royer-Collard’s doctrine was opposed by both ultraroyalists and revolutionists, and he was given the nickname “doctrinaire,” which was later capitalized and extended to his colleagues, thereafter known as the Doctrinaires.
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