cavernous

 
Pronunciation: /ˈkavənəs/

adjective

  • like a cavern in size, shape, or atmosphere: a dismal cavernous hall
  • giving the impression of vast, dark depths: his cavernous eyes

Derivatives

cavernously

adverb

Origin:

late Middle English: from Old French caverneux or Latin cavernosus (from caverna 'cavern')