Source : WordNet®

unsounded
     adj 1: 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" [syn: {profound}, {unfathomed}, {unplumbed}]
     2: not made to sound; "the silent `h' at the beginning of
        `honor'"; "in French certain letters are often unsounded"
        [syn: {silent}]