Definition of cavernous adjective from the Oxford Advanced Learner's Dictionary

 

cavernous

 adjective
adjective
BrE BrE//ˈkævənəs//
 
; NAmE NAmE//ˈkævərnəs//
 
(formal)
 
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(of a room or space) very large and often empty and/or dark; like a cave the vast, cavernous space of the empty concert hall Word Origin late Middle English: from Old French caverneux or Latin cavernosus (from caverna ‘cavern’, from cavus ‘hollow’).Extra examples He opened his cavernous mouth and yawned. The stage was cavernous and empty. We stepped into the vast, cavernous space of the empty concert hall.
See the Oxford Advanced American Dictionary entry: cavernous