mildewy

This term describes a specific sensory experience associated with fungal growth in moist environments. It carries a strong negative connotation, evoking images of neglect, decay, and poor ventilation. While it can describe a visual state, it is most frequently used to describe a pungent, musty odor.

Because it refers to a specific biological growth, it is more precise than general terms like musty or moldy. Musty describes a stale smell that may or may not be caused by fungi, whereas mildewy explicitly links the condition to the presence of mildew.