Synonyms and related words :
acknowledged, admitted, conventional, customary, established, fixed, folk, hallowed, heroic, hoary, immemorial, inveterate, legendary, long-established, long-standing, mythological, of long standing, of the folk, oral, prescriptive, received, recognized, rooted, time-honored, traditional, tried and true, true-blue, understood, unwritten, venerable, worshipful