1. quiet and timid and ineffectual

Similar word(s): timid, mousey

2. infested with mice

Similar word(s): mousey

3. of something having a drab pale brown color resembling a mouse

- a mousy brownish-grey color

- mousy hair

Similar word(s): chromatic, mouselike, mousey

Sentences with mousy as an adjective:

- It's a god-awful small affair to the girl with the mousy hair David Bowie - Life on Mars? (1971)