cavernous

/ˈkævərnəs/
adjective
  1. Resembling or characteristic of a cavern; very large, deep, or hollow, often in a way that feels empty or echoing.
    • She stared into the cavernous darkness of the abandoned mine shaft.
    • The old warehouse had a cavernous interior that echoed with every footstep.
    • The concert hall felt cavernous when only a few people were seated inside.
  2. Deeply set or sunken, especially in reference to eyes or cheeks, often suggesting illness or exhaustion.
    • The sick man's cavernous cheeks showed how much weight he had lost.
    • After weeks without sleep, his eyes looked cavernous and hollow.
    • Her cavernous gaze made her seem haunted and distant.
Antonyms
What does "cavernous" mean? | whatsthatwordmean | whatsthatwordmean