| duplicitous(fickle, untrustworthy, unprincipled) |
| extracurricular(fickle, untrustworthy, unprincipled, dirty-dealing) |
| fair-weather(fickle, untrustworthy, unprincipled) |
| false(adjective, dishonest, dubious, untrustworthy, unfaithful) |
| 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) |
| indeclinable |
| lacking |
| lacking faith(expression, idiom, irreligion) |
| lubricious(fickle, untrustworthy, unprincipled, dirty-dealing) |
| lying(fickle, untrustworthy, unprincipled, dirty-dealing) |
| mercentary(fickle, untrustworthy, unprincipled, dirty-dealing) |
| moonlighting(fickle, untrustworthy, unprincipled, dirty-dealing) |
| non-content |
| not converted(expression, idiom) |
| not true to(expression, idiom, fickle, untrustworthy, unprincipled) |
| of bad faith(expression, idiom, fickle, untrustworthy, unprincipled) |
| on the QT(expression, idiom, fickle, untrustworthy, unprincipled) |