| secret(dishonest, cunning, deceitful, sneaky, underhanded) |
| secretive(dishonest, cunning, deceitful, sly, devious) |
| serpentine(ambiguous, rambling, incidental, circuitous, tortuous) |
| sinister(ambiguous, rambling, incidental, circuitous, tortuous) |
| sinuous(ambiguous, rambling, incidental, circuitous, tortuous) |
| snaking(ambiguous, rambling, incidental, circuitous, tortuous) |
| snide(false, dishonest, deceitful, slick, sly) |
| spurious(fake, dishonest, deceitful, untrue) |
| stealthy(dishonest, cunning, deceitful, sly, devious) |
| sub-rosa(dishonest, cunning, deceitful, fickle, untrustworthy) |
| subsidiary(ambiguous, rambling, incidental, circuitous, tortuous) |
| surreptitious(dishonest, cunning, deceitful, tricky, sly) |
| suspicious |
| treasonable(adjective, mean, bad, base, false) |
| twisting(ambiguous, rambling, incidental, circuitous, tortuous) |
| two-timing(dishonest, cunning, deceitful, lying, fickle) |
| two faced |
| unctuous |
| undependable |
| unethical(dishonest, cunning, deceitful, fickle, untrustworthy) |