The Oxford Thesaurus An A-Z Dictionary of Synonyms - sectarian adj.

1) cultist, cultish, clannish, cliquish, partisan, partial, dogmatic, doctrinaire, factional: They seldom mingle with others, maintaining their sectarian existence. 2) parochial, narrow, narrow-minded, limited, insular, provincial, rigid, fanatic(al) , prejudicial, prejudiced, bigoted: Because they refused to consider ideas other than their own, they gradually became more and more sectarian in their views. --n. 3) adherent, member, sectary, votary, cultist, partisan: They tried to banish Anabaptists, Lutherans, Calvinists, and other sectarians. 4) (true) believer, dogmatist, fanatic, bigot, zealot, extremist, Slang nut, bug, fiend: Some of the sectarians engage in the ritualistic handling of live rattlesnakes.