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Synonyms for Conventional (same or very similar meaning)

WordNet sense 1 (represented in simplified or symbolic form):
schematic

WordNet sense 2 (of or relating to a style of art in which objects do not resemble those known in physical nature):
nonrepresentational

WordNet sense 3 (conforming with accepted standards):
established

WordNet sense 4 (adhering to what is commonly accepted):
orthodox

WordNet sense 5 (rigidly formal or bound by convention):
ceremonious

WordNet sense 6 (being in accord with established forms and conventions and requirements (as e.g. of formal dress)):
formal

WordNet sense 7 (lacking spontaneity or originality or individuality):
stereotypical

WordNet sense 8 (rigidly conventional or old-fashioned):
square, straight

WordNet sense 9 (unimaginatively conventional):
conservative

WordNet sense 10 (in accordance with convention or custom):
customary

WordNet sense 11 (widely accepted as true or worthy):
accepted

WordNet sense 12 (consisting of or derived from tradition):
traditional


From the ODE community, based on WordNetadd/edit