I. “+ adjective
Etymology: un- (I) + sounded, past participle of sound
: not pronounced or spoken : not made to sound
the words stopped at her lips unsounded
in French certain letters are often unsounded
II. adjective
Etymology: un- (I) + sounded, past participle of sound to fathom
: not fathomed or probed
remote and unsounded caverns — S.A.Coblentz
the unsounded depths of human misery