Synonyms of 'cavernous'

abysmal, abyssal, bottomless, commodious, concave, cupped, cymbiform, dished, fathomless, hollow, infundibular, infundibuliform, navicular, plumbless, retiring, scaphoid, scyphate, sepulchral, soundless, sunk, sunken, unfathomable, unfathomed, unsounded, vast, yawning