| questioning(uncertain, doubtful, unsure) |
| quicksilver(fickle, untrustworthy, unprincipled) |
| sharp(adjective, false, dishonest, deceitful, unreliable) |
| slippy |
| snake in grass(expression, idiom, fickle, untrustworthy, unprincipled) |
| sneaky(adjective, false, dishonest, deceitful, unreliable) |
| stop-at-nothing(fickle, untrustworthy, unprincipled) |
| stop at nothing(expression, idiom, fickle, untrustworthy, unprincipled) |
| sub-rosa(fickle, untrustworthy, unprincipled) |
| traitorous(fickle, untrustworthy, unprincipled) |
| treasonable(fickle, untrustworthy, unprincipled) |
| treasonous(fickle, untrustworthy, unprincipled) |
| trick(loose, unpredictable, unreliable, variable, irresponsible) |
| truster |
| two-faced(adjective, false, dishonest, deceitful, unreliable) |
| unconverted(fickle, untrustworthy, unprincipled) |
| under cover(expression, fickle, untrustworthy, unprincipled) |
| underhand(fickle, untrustworthy, unprincipled) |
| undutiful(fickle, untrustworthy, unprincipled) |
| unethical(fickle, untrustworthy, unprincipled) |