English

Adverb

cavernously ‎(comparative more cavernously, superlative most cavernously)

1. In a cavernous manner; like a cavern.
   • 1933: Robert Howard, Black Colossus

     The lurid unearthly glow still hovered in the shadowy chamber, lighting ghostlily the dead face of Thugra Khotan, which seemed to grin mirthlessly and cavernously at them.

2. In a cavernous manner; sounding deep, hollow, or echoey.
   • 1899: Stephen Crane, Making an Orator

     ...the mother of the boy was alarmed beyond measure at Jimmie's curious illness, which caused him to lie on the rug in front of the fire and groan cavernously.