Definitions
1.AdjectiveAffected by dampness or mould; damp, mildewed, mouldy.
2.AdjectiveHaving an odour or taste of mould; also , having a stale or unfresh odour or taste."musty food musty furniture a musty odour"
3.AdjectiveCharacteristic of or relating to mould or mouldiness.
4.AdjectiveOf attitudes, ideas, writing, or other abstract things: no longer fresh or interesting; outdated, stale.
5.AdjectiveOf attitudes, ideas, writing, or other abstract things: no longer fresh or interesting; outdated, stale.
6.AdjectiveOf a person: boring and unadventurous; also, old-fashioned, stuck in the past.
7.AdjectiveBad-tempered, grumpy, irritable.
8.NounA type of snuff with a musty flavour (adjective sense 2).
9.VerbTo turn musty (adjective sense 1 or 2); to must.
10.AdjectiveOf a male animal such as a camel or an elephant: in musth.