Resembling a cavern in size, shape, or atmosphere; large and hollow. The old warehouse had a cavernous interior that echoed with every footstep.
Suggestive of a cavern in depth or vastness. His voice was deep and cavernous, resonating through the hall.
Relating to or involving cavernous tissue or structures characterized by blood-filled spaces. The MRI revealed a cavernous hemangioma in the patient's brain.