of, pertaining to, or conforming to the approved form of any doctrine, philosophy, ideology, etc.

of, pertaining to, or conforming to beliefs, attitudes, or modes of conduct that are generally approved.

customary or conventional, as a means or method; established.

sound or correct in opinion or doctrine, esp. theological or religious doctrine.

conforming to the Christian faith as represented in the creeds of the early church.

( initial capital letter ) of, pertaining to, or designating the Eastern Church, esp. the Greek Orthodox Church.

( initial capital letter ) of, pertaining to, or characteristic of Orthodox Jews or Orthodox Judaism.

adjective

heterodox , unconventional , unorthodox , untraditional

adjective

according to the book , acknowledged , admitted , approved , authoritative , buttoned-down * , by the numbers * , canonical , conformist , conservative , conventional , correct , customary , devout , die-hard , doctrinal , established , in line , legitimate , official , old-line , pious , proper , punctilious , reactionary , received , recognized , religious , right , rightful , sanctioned , sound , square , standard , straight , straight arrow , traditionalistic , true , well-established , time-honored , button-down , establishmentarian , traditional , rightist , right-wing , tory , traditionalist , accepted

noun

rightist , right-winger , tory , traditionalist