1 accepted, bog-standard (Brit. & Irish slang) common, correct, customary, decorous, expected, formal, habitual, normal, ordinary, orthodox, prevailing, prevalent, proper, regular, ritual, standard, traditional, usual, wonted
2 banal, bourgeois, commonplace, hackneyed, hidebound, pedestrian, Pooterish, prosaic, routine, run-of-the-mill, stereotyped, unoriginal, vanilla (slang)
Antonyms
abnormal, left-field (informal) off-the-wall (slang) uncommon, unconventional, unorthodox