In the first place, it is likely to have a slight musky or mousy odor about it.
A bat was flying somewhere near—he felt the wind from its mousy wings.
Head and ears were mousy, the neck long, with a hump at its base.
They were kept on plates on sideboards in the sun, or thrust into mousy cupboards.
You have mousy ways and, if you were black, I should say you were a rat.