Definitions from Wiktionary ( )

▸ adjective:  Affected by dampness or mould; damp, mildewed, mouldy.
▸ adjective:  Having an odour or taste of mould; also (generally), having a stale or unfresh odour or taste.
▸ adjective:  Characteristic of or relating to mould or mouldiness.
▸ adjective:  (figuratively)
▸ adjective:  Of attitudes, ideas, writing, or other abstract things: no longer fresh or interesting; outdated, stale.
▸ adjective:  Of a person: boring and unadventurous; also, old-fashioned, stuck in the past.
▸ adjective:  (archaic except Northern England (northwest)) Bad-tempered, grumpy, irritable.
▸ noun:  (obsolete) A type of snuff with a musty flavour (adjective sense 2).
▸ verb:  (intransitive, obsolete) To turn musty (adjective sense 1 or 2); to must.
▸ adjective:  (rare) Of a male animal such as a camel or an elephant: in musth.

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