definition of
unsounded

[1] #1 unsounded s. [profound, unfathomed, unplumbed] situated at or extending to great depth; too deep to have been sounded or plumbed; "the profound depths of the sea"; "the dark unfathomed caves of ocean"-Thomas Gray; "unplumbed depths of the sea"; "remote and unsounded caverns". wn

[2] #2 unsounded s. [silent] not made to sound; "the silent 'h' at the beginning of 'honor'"; "in French certain letters are often unsounded". wn