be as quiet as a mouse

to be very quiet She was as quiet as a mouse. I didn't even know she'd come in.

Name	Pronounced	Usage
ÓSkar	-	Icelandic
Halli	-	Ancient Scandinavian
Mohinder	-	Indian (Sikh)
Aslaug	-	Norwegian
Hamon	-	Medieval English
Bosmat	-	Hebrew