Adjective has 2 senses

• unsounded(s = adj.all) profound, unfathomed, unplumbed - situated at or extending to great depth; too deep to have been sounded or plumbed; "remote and unsounded caverns"; "the dark unfathomed caves of ocean"; "the profound depths of the sea"; "unplumbed depths of the sea"


• unsounded(s = adj.all) silent - not made to sound; "in French certain letters are often unsounded"; "the silent `h' at the beginning of `honor'"