• faddish
• fad-ish

Fromfad +‎-ish.

fadish (comparativemorefadish,superlativemostfadish)

1. Having the characteristics of afad.
   • 1990 January 21, John Stanley, “'The Simpsons': Cartoon Clan of The Grotesque”, inSan Francisco Chronicle:

     And with a wave of merchandising almost ready to go, there is every indication offadish success.