| sneak(adjective, clandestine, underground, undisclosed) |
| sneaking(adjective, mean, smooth, honest, dishonest) |
| oblique(adjective, obscure, dishonest, cunning, deceitful) |
| underhanded(adjective, dishonest, cunning, deceitful, crafty) |
| backstairs(adjective, clandestine, underground, undisclosed) |
| cloak-and-dagger(adjective, full, secret, clandestine, underground) |
| devious(adjective, dishonest, cunning, deceitful, tricky) |
| fraudulent(adjective, deception, dishonest, cunning, deceitful) |
| confidential(adjective, secret, hidden, spy, clandestine) |
| deceitful(adjective, mean, smooth, dishonest, crafty) |
| occult(noun, secret, unknown, hidden, underground) |
| privy |
| crafty(adjective, mean, smooth, dishonest, cunning) |
| factitious(adjective, deception, untruth) |
| lurking |
| quiet(adjective, intriguing) |
| under-the-table(adjective, secret, hidden, clandestine, sneaky) |
| undisclosed(adjective, secret, unknown, hidden, concealed) |
| veiled(adjective, secret, unknown, hidden, clandestine) |
| ambiguous(obscure, clandestine, underground, undisclosed) |