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Synonyms for Old-hat (same or very similar meaning)

WordNet sense 1 (repeated too often; overfamiliar through overuse):
well-worn

WordNet sense 2 (not original; not being or productive of something fresh and unusual):
unoriginal

WordNet sense 3 (out of fashion):
antique, old-fashioned, outmoded, passe, passee

WordNet sense 4 (not in accord with or not following current fashion):
unfashionable, unstylish


From the ODE community, based on WordNetadd/edit