| fly by night(expression, idiom, fickle, untrustworthy, unprincipled) |
| foresworn(fickle, untrustworthy, unprincipled) |
| illegal |
| inconstant(fickle, untrustworthy, unprincipled) |
| involving bigamy(expression, idiom) |
| 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) |
| polygamous(fickle, untrustworthy, unprincipled) |
| polygynous |
| quicksilver(fickle, untrustworthy, unprincipled) |
| snake in grass(expression, idiom, fickle, untrustworthy, unprincipled) |
| stop-at-nothing(fickle, untrustworthy, unprincipled) |