Pronunciation (UK) (US) IPA (key): /ˈmʌstɪ/ Audio (US)(file) Adjective Positive musty Comparative mustier Superlative mustiest If something is musty, it is affected by dampness or mould. Synonym: fusty If something is musty, it has the smell or taste of mould. Synonym: fustyWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads