Synonyms for Threadbare (same or very similar meaning)
WordNet sense 1 (affected by wear; damaged by long use):
wornWordNet sense 2 (repeated too often; overfamiliar through overuse):
banal, commonplace, hackneyed, shopworn, stock, timeworn, tired, trite, well-worn, old-hatWordNet sense 3 (not original; not being or productive of something fresh and unusual):
unoriginalFrom the ODE community, based on WordNetadd/edit