The word "mousy" is an adjective that means something resembling a mouse, and in particular it can refer to colour, features or personality. In the sense of ones personality it refers to it being ineffectual or timid. It can also refer to an infestation of mice in a particular area or the smell of mice emanating from there.
When referring to features of a person they refer to their hair being brown in colour like that of a mouse and their features resembling those of the same. In terms of behaviour and personality it defines one as being dull, drab or quiet.
When referring to features of a person they refer to their hair being brown in colour like that of a mouse and their features resembling those of the same. In terms of behaviour and personality it defines one as being dull, drab or quiet.