Definition of "cavernous"

cavernous

/ˈkav.ən.əs/

adjective
comparative more cavernous, superlative most cavernous
1. Resembling a cavern in size, shape, or atmosphere.
  Quotations
  The last stop on the West Coast Main Line before you cross the border into Scotland, the strategically placed Carlisle Citadel is a station steeped in history. Opened on September 1 1847, the cavernous station was once home to seven railway companies in the pre-Grouping years.
  2019 November 20, Paul Stephen, “Lakes and lines offer scenery to savour”, in Rail, page 54
  1. Giving the impression of vast, dark depths.
    Quotations
    While the filmmakers behind Dear Evan Hansen have maintained that their biggest motivation for adapting the popular Broadway musical was to immortalize Platt’s Tony-winning titular performance, what they’ve actually done by having the 27-year-old play a high school senior is highlight the stage show’s cavernous weaknesses while failing to transport just about any of its strengths to the new medium.
    2021 September 22, Caroline Siede, “Dear Evan Hansen is a misfire on just about every level”, in AV Club‎
2. Having many caverns.
  1. (anatomy, zootomy) Composed largely of vascular sinuses and capable of dilating with blood to bring about the erection of a body part.
  2. (dentistry) Having cavities.