1. Worn or faded from being on display in a store
   "shopworn merchandise at half price";
   - shop-soiled [Brit]
    
2. Repeated too often; overfamiliar through overuse
   "his remarks were trite and shopworn";
   - banal, commonplace, hackneyed, old-hat [informal], stock, threadbare, timeworn, tired, trite, well-worn, shop-soiled [Brit]

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

Encyclopedia: Shopworn