GNU Collaborative International Dictionary of English

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1.       
   Musty (?), a. [Compar. Mustier (?); superl. Mustiest.] [From L. mustum must; or perh. fr. E. moist.  Cf. Must, n., Moist.]
   1. Having the rank, pungent, offensive odor and taste which substances of organic origin acquire during warm, moist weather; foul or sour and fetid; moldy; as, “musty corn; musty books.”  Harvey.
   
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   2. Spoiled by age; rank; stale.
   
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   The proverb is somewhat musty. Shak.
   
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   3. Dull; heavy; spiritless. “That he may not grow musty and unfit for conversation.”  Addison.
   
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