1. (adj)profound, unfathomed, unplumbed, unsounded situated at or extending to great depth; too deep to have been sounded or plumbed Synonyms: sound, heavy, unfathomed, wakeless, profound, silent, fundamental, unplumbed, unsounded Antonyms: audible, shallow, hearable
2. (adj)silent, unsounded not made to sound Synonyms: soundless, tacit, mute, unfathomed, unplumbed, profound, silent, still, understood, mum, dumb, unsounded Antonyms: hearable, shallow, audible