caverned

adjective2

1. •
   (literary) Pitted or hollowed out with caverns.

   • The wolves yelled on the caverned hill Where echo tolled in thunder still — 1815
2. •
   Living in a cavern.

   • No Bandit fierce, no Tyrant mad with pride, / No cavern'd Hermit, rest self-satisfy'd; / Who most to shun or hate mankind pretend, / Seek an Admirer, or wou'd fix a Friend. — 1733