Synonyms for established

arranged, confirmed, conventional, created, determinate, determined, developed, diagnosed, empowered, familiar, firm, fixed, formed, found, founded, habitual, identified, implemented, inaugurated, indisputable, industrious, initiated, installed, instituted, introduced, known, located, long-established, mature, normal, originated, orthodox, predetermined, proper, proved, proven, recognized, resolved, routine, secure, set, settled, situated, standard, started, stationed, stipulated, substantiated, temperament, traditional, unarguable, undisputable, undoubted, usual