| slippery(adjective, dishonest, cunning, deceitful, crooked) |
| sly(adjective, dishonest, secret, clandestine, sneaky) |
| sneak(adjective, close, clandestine, underground, undisclosed) |
| sneaking(adjective, dishonest, cunning, deceitful, secret) |
| sneaky(adjective, dishonest, cunning, secret, clandestine) |
| stealthy(adjective, quiet, dishonest, secret, clandestine) |
| top secret(expression, adjective, close, sensitive, clandestine) |
| treacherous(adjective, dishonest, cunning, deceitful, fickle) |
| tricky(adjective, dishonest, cunning, deceitful, sneaky) |
| two-faced(adjective, dishonest, cunning, deceitful, crooked) |
| two-timing(adjective, dishonest, cunning, deceitful, fickle) |
| unacknowledged(adjective, close, sensitive, clandestine, underground) |
| under cover(expression, adjective, secret, fickle, untrustworthy) |
| under false pretense(expression, adjective, idiom, close, sensitive) |
| under wraps(expression, adjective, dishonest, secret, sneaky) |
| underhand(adjective, cunning, deceitful, secret, clandestine) |
| underhanded(adjective, dishonest, cunning, deceitful, clandestine) |
| unethical(adjective, dishonest, cunning, deceitful, fickle) |
| unfair(adjective, dishonest, cunning, deceitful, crooked) |
| unjust(adjective, dishonest, cunning, deceitful, crooked) |