A dormant volcano is a volcano that is "sleeping," for lack of a better term. It is a volcano that is not currently active.
quiet
Silent is another word for quiet.
its an eruption which is quiet.
A volcano that is not active is a dormant volcano.
Let me answer that by asking you this...have you ever heard of a frickin VOLCANO that is quiet????
quiet
stealth
subterranean
a dud
EROPSHIN
Another word could be shy, quiet, close-mouthed, and mute.
Another word for quiet or motionless could be silent or still.