Synonyms for cavernous

Adjective

1. cavernous, hollow (vs. solid)

usage: being or suggesting a cavern; "vast cavernous chambers hollowed out of limestone"

2. erectile, cavernous, expansive (vs. unexpansive)

usage: filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood; "erectile tissue"; "the penis is an erectile organ"