| conspiratorial(adjective, clandestine, underground, sneaky, covert) |
| crafty(adjective, dishonest, cunning, deceitful, sneaky) |
| crooked(adjective, dishonest, cunning, deceitful, sneaky) |
| cryptic(adjective, close, clandestine, underground, undisclosed) |
| cunning(adjective, dishonest, deceitful, sneaky, underhanded) |
| deceptive(adjective, dishonest, cunning, deceitful, crooked) |
| devious(adjective, dishonest, cunning, deceitful, crooked) |
| dirty-dealing(adjective, dishonest, cunning, deceitful, fickle) |
| discreet(adjective, close, clandestine, underground, undisclosed) |
| disguised(adjective, secret, hidden, clandestine, underground) |
| dishonest(adjective, cunning, deceitful, fickle, untrustworthy) |
| dishonorable(adjective, dishonest, cunning, deceitful, crooked) |
| dissembled(adjective, close, clandestine, underground, undisclosed) |
| dissimulated(adjective, close, clandestine, underground, undisclosed) |
| double-crossing(adjective, dishonest, cunning, deceitful, fickle) |
| duplicitous(adjective, dishonest, cunning, deceitful, fickle) |
| elusive(adjective, sneaky, covert, secretive) |
| evasive(adjective, sneaky, covert, secretive) |
| foxy(adjective, sneaky, covert, secretive) |
| fraudulent(adjective, dishonest, cunning, deceitful, private) |