| extracurricular(fickle, untrustworthy, unprincipled) |
| fair-weather(fickle, untrustworthy, unprincipled) |
| faithless(fickle, untrustworthy, unprincipled) |
| falsehearted(fickle, untrustworthy, unprincipled) |
| fickle(untrustworthy, unprincipled) |
| fly by night(expression, idiom, fickle, untrustworthy, unprincipled) |
| foresworn(fickle, untrustworthy, unprincipled) |
| illegal |
| inconstant(fickle, untrustworthy, unprincipled) |
| lubricious(fickle, untrustworthy, unprincipled) |
| lying(fickle, untrustworthy, unprincipled) |
| mercentary(fickle, untrustworthy, unprincipled) |
| moonlighting(fickle, untrustworthy, unprincipled) |
| not true to(expression, idiom, fickle, untrustworthy, unprincipled) |
| of bad faith(expression, idiom, fickle, untrustworthy, unprincipled) |
| on the QT(expression, idiom, fickle, untrustworthy, unprincipled) |
| on the quiet(expression, idiom, fickle, untrustworthy, unprincipled) |
| perfidious(fickle, untrustworthy, unprincipled) |
| perjurious(fickle, untrustworthy, unprincipled) |
| quicksilver(fickle, untrustworthy, unprincipled) |