| hole-and-corner |
| hugger-mugger |
| lubricious(adjective, honest, underhand) |
| lying(adjective, mean, bad, evil, false) |
| mendacious(adjective, false, dishonest, cunning, deceitful) |
| nefarious(adjective, dishonest, immoral, rotten, untrustworthy) |
| oblique(false, dishonest, cunning, deceitful, tricky) |
| prevaricating(adjective, dishonest) |
| private(secret, hidden, clandestine, underground, undisclosed) |
| roguish(adjective, false, deceitful, misleading, illusory) |
| rotten(adjective, low, dishonest, immoral, untrustworthy) |
| secretive(adjective, corrupt, dishonest, deceitful, secret) |
| slinking(sneaky, covert, secretive) |
| sneak(clandestine, underground, undisclosed) |
| ulterior(secret, hidden, clandestine, underground, privy) |
| unctuous(adjective, false, deceitful, lying, untruthful) |
| under-the-table(secret, hidden, clandestine, underground, sneaky) |
| undue(adjective, improper, excessive, unnecessary) |
| unprincipled(adjective, false, dishonest, immoral, deceitful) |
| unreliable(adjective, false, true, dishonest, deceitful) |