1. infested with mice • Syn: mousy • Pertains to noun: mouse, mouse (for: mousy) • Derivationally related forms: mouse, mouse (for: mousy) 2. of something having a drab pale brown color resembling a mouse - a mousy brownish-grey color - mousy hair - mouse-colored hair • Syn: mousy, mouse-colored, mouselike • Similar to: chromatic 3. quiet and timid and ineffectual • Syn: mousy • Similar to: timid • Derivationally related forms: mouse, mouse (for: mousy)