| dubitable(adjective, uncertain, doubtful, shaky, dubious) |
| false(adjective, fake, counterfeit, dishonest, sham) |
| grim(adjective, dull, dark, gloomy) |
| iffy(adjective, uncertain, doubtful, shaky, dubious) |
| illegal(adjective, bad, wrong, corrupt, vicious) |
| lurid(adjective, dull, dark, gloomy, dirty) |
| misty(adjective, dull, dark, gloomy, dim) |
| nefarious(adjective, wrong, corrupt, vicious, vile) |
| odd(adjective, unusual, strange, irregular, doubtful) |
| off-color(adjective, dirty, corrupt, foul, vulgar) |
| racy(adjective, informal, dirty, foul, vulgar) |
| seedy(adjective, nasty, low, unpleasant, careless) |
| shadow |
| shrewd(adjective, dishonest, deceitful, dubious, suspicious) |
| sinister(adjective, false, corrupt, dishonest, immoral) |
| slicky |
| sneaky(adjective, bad, wrong, false, corrupt) |
| sombre |
| strange(unusual, unexpected) |
| suggestive(adjective, dirty, foul, vulgar, improper) |