| perfidious(adjective, false, deceitful, lying, subtle) |
| sinister(adjective, false, deceitful, lying, ambiguous) |
| slinky(adjective, move) |
| snaky(adjective, sly, devious) |
| underground(adjective, clandestine, undisclosed) |
| unethical(adjective, bad, wrong, informal, corrupt) |
| untruthful(adjective, false, corrupt, dishonest, cunning) |
| vulpine |
| wicked |
| back-door |
| cagey(mean, smooth, cunning, dubious, untrustworthy) |
| conniving(adjective, mean, smooth, smart, false) |
| deep(cunning, sly, crafty, clandestine, underground) |
| evasive(dishonest, deceitful, dubious, untrustworthy, crafty) |
| faithless(adjective, false, dishonest, cunning, deceitful) |
| far-fetched(shaky, unlikely, unpromising) |
| hypocritical(adjective, false, deceitful, lying, double) |
| immoral(adjective, bad, wrong, low, corrupt) |
| improper(adjective, wrong, immoral, unprincipled) |
| ingenious(mean, smooth, cunning, sly, treacherous) |