| under-the-table(adjective, secret, private, hidden, clandestine) |
| underhanded(adjective, dishonest, deceitful, secret, clandestine) |
| arcane(adjective, strange, secret, clandestine, underground) |
| asylum(noun, cover, attack, protection, screen) |
| blanket |
| cloak-and-dagger(adjective, show, full, secret, clandestine) |
| covering |
| esoteric(adjective, strange, secret, unknown, hidden) |
| haven(noun, cover, attack, protection, screen) |
| hideaway(noun, place, cover, show, protection) |
| hiding place(noun, expression, idiom, protection, screen) |
| hole-and-corner(secret, private, hidden, spy, sneaky) |
| recondite(adjective, strange, secret, unknown, hidden) |
| secluded(adjective, close, quiet, private, unknown) |
| shield(noun, cover, protection, shelter, security) |
| skulking(adjective, secret, private, hidden, sneaky) |
| sub rosa(adjective, show, clandestine, underhanded) |
| unknown(strange, secret, hidden, curious, concealed) |
| abstruse(strange, secret, unknown, hidden, curious) |
| blind |