Adjective: threadbare 'thred,behr
- Having the nap worn away so that the threads show through
"threadbare rugs"
- 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]
See also: clichéd, cornball [N. Amer, informal], hacky [informal], unoriginal, worn