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cavernous

adjective
 
 
/ˈkæv.ən.əs/ US  /-ɚn-/

Definition

If something is cavernous, there is a very large open space inside it: a cavernous 4,000-seat theatreEnormousBig and quite big
(Definition of cavernous adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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