The definition of mousy is a shy and nervous person, or someone with a drab appearance.
(adjective)An example of mousy is a person who is anxious around others and doesn't want to speak in group settings.
See mousy in Webster's New World College Dictionary
Related Forms:
See mousy in American Heritage Dictionary 4
also mous·ey
adjective mous·i·er, mous·i·estLearn more about mousy