WordWeb Online

1. Stale and unclean smelling
   "What are you going to do with all that fusty old art and history of yours?";
   - musty, frowsty [Brit, informal]
    
2. Old-fashioned and out of date
   - standpat, unprogressive, nonprogressive

Derived forms: fustiest, fustier

See also: conservative, ill-smelling, malodorous, malodourous [Brit, Cdn, non-standard], minging [Brit, informal], pongy [Brit, informal], stinky [informal], unpleasant-smelling, whiffy [Brit, informal]