Orthodox1. (a.) Sound in opinion or doctrine, especially in accepted religious doctrine; hence, holding the Christian faith; believing the doctrines taught in the Scriptures; -- opposed to heretical and heterodox; as, an orthodox Christian.
2. (a.) According or congruous with the doctrines of Scripture, the creed of a church, the decree of a council, or the like; as, an orthodox opinion, book, etc.
3. (a.) Approved; conventional.
Thesaurus Entries
Christian, Orthodox Jew, Sunni Muslim, accepted, accordant, accustomed, acknowledged, admitted, anal, approved, authentic, authoritative, authorized, being done, bourgeois, button-down, canonical, canonist, comme il faut, common, compulsive, concordant, conformable, conformist, conservative, conventional, correct, corresponding, customary, de rigueur, decent, decorous, die-hard, doctrinal, dour, established, evangelical, faithful, firm, fogyish, formal, formalistic, fundamentalist, hard, harmonious, hidebound, impliable, in accord, in keeping, in line, in step, inexorable, inflexible, iron, ironbound, ironclad, ironhanded, kosher, literal, meet, muscle-bound, obdurate, obstinate, of the faith, official, old-line, ordinary, orthodox Christian, orthodoxical, orthodoxist, pedantic, plastic, popular, precisianistic, prevailing, prevalent, procrustean, proper, purist, puristic, puritan, puritanic, reactionary, received, recognized, regular, relentless, right, rigid, rigorist, rigoristic, rigorous, rockbound, sanctioned, scriptural, seemly, sound, square, standard, stiff, straight, straightlaced, straitlaced, stubborn, stuffy, textual, textualist, textuary, the orthodox, tory, traditional, traditionalist, traditionalistic, TRUE, true believer, true-blue, unbending, uncompromising, unrelenting, unyielding, uptight