fusty(moldy or musty) adjective [UK: ˈfʌ.sti] [US: ˈfʌ.sti]
mouldy [mouldier, mouldiest](covered with mould) adjective [UK: ˈməʊl.di] [US: ˈmoʊl.di]
musty [mustier, mustiest](having an odour or taste of mould; (generally) having a stale or unfresh odour or taste) adjective [UK: ˈmʌ.sti] [US: ˈmʌ.sti]