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Adjective: musty (mustier,mustiest)  mús-tee
  1. Covered with or smelling of mould
    "a musty odour";
    - moldy [N. Amer], mouldy [Brit, Cdn]
     
  2. Stale and unclean smelling
    "What are you going to do with all that musty old art and history of yours?";
    - fusty, frowsty [Brit]

Derived forms: mustier, mustiest

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