IPA: /ˈmʌstɪli/
KK: /ˈmʌstɪli/
In a way that is stale, damp, or has a moldy smell, often associated with old or neglected places.
The old attic smelled mustily, making it clear that it hadn't been opened in years.
Mustily → It originates from the word 'musty' (from Middle English *musti*, meaning moldy or stale) combined with the adverbial suffix '-ly' (meaning in a manner of). The word 'mustily' describes something that is done in a moldy or stale manner, often referring to an unpleasant smell.
Think of 'musty' which means stale or moldy, and remember that 'mustily' describes something that has that stale quality.