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Adjective: threadbare  'thred,behr
  1. Repeated too often; overfamiliar through overuse
    "repeating threadbare jokes";
    - banal, commonplace, hackneyed, old-hat [informal], shopworn [N. Amer], stock, timeworn, tired, trite, well-worn, shop-soiled [Brit]
  2. Having the nap worn away so that the threads show through
    "threadbare rugs"

See also: cornball [N. Amer, informal], unoriginal, worn