1. [ adjective ] situated at or extending to great depth; too deep to have been sounded or plumbed
Synonyms: unplumbed unfathomed profound

"the profound depths of the sea" "the dark unfathomed caves of ocean"-Thomas Gray "unplumbed depths of the sea" "remote and unsounded caverns"

Related terms: deep
2. [ adjective ] not made to sound
Synonyms: silent

"the silent `h' at the beginning of `honor'" "in French certain letters are often unsounded"

Related terms: inaudible
Similar spelling:   unsound