| estranged(adjective, untrue, untrustworthy, treacherous, unfaithful) |
| extracurricular(fickle, untrustworthy, unprincipled, dirty-dealing) |
| fair-weather(fickle, untrustworthy, unprincipled) |
| falsehearted(fickle, untrustworthy, unprincipled, dirty-dealing) |
| fluctuating(adjective, false, dishonest, dubious, untrue) |
| fly by night(expression, idiom, fickle, untrustworthy, unprincipled) |
| foresworn(fickle, untrustworthy, unprincipled, dirty-dealing) |
| imprecise |
| lubricious(fickle, untrustworthy, unprincipled, dirty-dealing) |
| mercentary(fickle, untrustworthy, unprincipled, dirty-dealing) |
| moonlighting(fickle, untrustworthy, unprincipled, dirty-dealing) |
| on the QT(expression, idiom, fickle, untrustworthy, unprincipled) |
| on the quiet(expression, idiom, fickle, untrustworthy, unprincipled) |
| perjurious(fickle, untrue, untrustworthy, unprincipled, dirty-dealing) |
| polygamous(fickle, untrustworthy, unprincipled) |
| quicksilver(fickle, untrustworthy, unprincipled, dirty-dealing) |
| seditious(adjective, untrue, untrustworthy, treacherous, unfaithful) |
| snake in grass(expression, idiom, fickle, untrustworthy, unprincipled) |
| snaky(adjective, untrue, untrustworthy, treacherous, unfaithful) |
| stop-at-nothing(fickle, untrustworthy, unprincipled, dirty-dealing) |