Definition of Mousy

Babylon English Dictionary
like a mouse; resembling a mouse; cowardly; quiet; drab; mice-infested (also mousey)
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Mousy Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(a.)
Infested with mice; smelling of mice.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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mousy
\mous"y\ (?), a. infested with mice; smelling of mice.

ENGLISH IDIOMS 2.EDITION
worn and faded, shabby This shirt is kind of mousy, but I love to wear it.
English Idioms WM 1.3a
worn and faded, shabby 
This shirt is kind of mousy, but I love to wear it.
WordNet 2.0

Adjective
1. timid and ineffectual
(synonym) mousey
(similar) timid
2. having a drab pale brown color resembling a mouse; "a mousy grownish-gray color"; "mouse-colored hair"; "a mouselike rodent"
(synonym) mouse-colored, mouselike
(similar) chromatic