MOUSY Meaning of MOUSY in English (also mousey ) ■ adjective ( mousier , mousiest ) 1》 of or like a mouse. 2》 (of hair) of a dull, light brown colour. 3》 shy and timid.Derivativesmousiness noun Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004