| merciless(adjective, senseless, unwarranted, reckless, malicious) |
| moonlighting(adjective, false, improper, fickle, untrue) |
| not true to(expression, adjective, idiom, false, fickle) |
| oblique(dishonest, cunning, deceitful, crooked, sneaky) |
| of bad faith(expression, adjective, idiom, false, fickle) |
| on the QT(expression, adjective, idiom, dishonest, cunning) |
| on the quiet(expression, adjective, idiom, dishonest, cunning) |
| ornery(adjective, senseless, unwarranted, reckless, malicious) |
| perverse(adjective, senseless, unwarranted, reckless, malicious) |
| philandering(adjective, false, untrue, disloyal, cheating) |
| quisling |
| recreant(adjective, false, dishonest, deceitful, lying) |
| seditious(adjective, untrue, untrustworthy, treacherous, unfaithful) |
| sellout(noun, deception, dishonesty, treachery, disloyalty) |
| shady(adjective, bad, wrong, false, corrupt) |
| shifty(adjective, wrong, false, dishonest, cunning) |
| slippery(adjective, bad, wrong, false, dishonest) |
| sly(corrupt, dishonest, immoral, cunning, deceitful) |
| snaky(adjective, false, untrue, untrustworthy, treacherous) |
| sneaking(adjective, false, dishonest, cunning, deceitful) |