| Main Entry: | subterranean |
| Part of Speech: | adjective |
| Definition: | hidden, underground |
Synonyms: |
below ground, buried, covered, covert, hush-hush, on the QT, private, secret, subterrestrial, subversive, sunken, under wraps, underfoot |
| Main Entry: | deep |
| Part of Speech: | adjective |
| Definition: | extending very far, usually down |
Synonyms: |
abysmal, abyssal, below, beneath, bottomless, broad, buried, deep-seated, distant, downreaching, far, fathomless, immersed, inmost, low, profound, rooted, subaqueous, submarine, submerged, subterranean, sunk, underground, unfathomable, wide, yawning |
Antonyms: |
shallow |
| Main Entry: | infernal |
| Part of Speech: | adjective |
| Definition: | damned; underworld |
Synonyms: |
accursed, blamed, blasted, chthonian, confounded, cursed, cussed, damnable, demonic, devilish, diabolical, execrable, fiendish, hellish, lower, malevolent, malicious, monstrous, nether, satanic, subterranean, sulphurous, wicked |
Antonyms: |
heavenly, otherworldly |
| Main Entry: | profound |
| Part of Speech: | adjective |
| Definition: | bottomless |
Synonyms: |
abysmal, buried, cavernous, deep, fathomless, subterranean, yawning |
Antonyms: |
shallow, slight |
| Main Entry: | underground |
| Part of Speech: | adjective |
| Definition: | below the surface |
Synonyms: |
below ground, buried, covered, in the recesses, subterranean, subterrestrial, sunken, underfoot |
Antonyms: |
aboveground, ground, sky |
| Main Entry: | hypogeal |
| Part of Speech: | adjective |
| Definition: | underground |
Synonyms: |
below ground, buried, covered, hypogean, hypogeous, in the recesses, subterranean, subterrestrial, sunken, underfoot |
| Main Entry: | hypogean |
| Part of Speech: | adjective |
| Definition: | underground |
Synonyms: |
below ground, buried, covered, hypogeal, 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 |