| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | underground |
| Synonyms: | below ground, buried, covered, hypogean, hypogeous, in the recesses, subterranean, subterrestrial, sunken, underfoot |
| Main Entry: | hypogeous |
| Part of Speech: | adjective |
| Definition: | underground |
| Synonyms: | below ground, buried, covered, hypogeal, hypogean, in the recesses, subterranean, subterrestrial, sunken, underfoot |
| Main Entry: | subterrestrial |
| Part of Speech: | adjective |
| Definition: | underground |
| Synonyms: | alternative, avant-garde, clandestine, concealed, covert, experimental, hidden, hush-hush, hypogeal, hypogean, hypogeous, on the QT, on the sly, private, radical, resistant, resistive, revolutionary, subterranean, surreptitious, unbowed, unconventional, under wraps, undercover, unusual |