| threatening(verb, adjective, person, force, strong) |
| ominous(adjective, person, unpleasant, awful, feelings) |
| sinister(adjective, person, sad, dark, unpleasant) |
| foreboding(noun, adjective, person, tough, dark) |
| forbidding(adjective, person, tough, dark, unpleasant) |
| dangerous(adjective, strong, tough, severe, intense) |
| dark(adjective, unpleasant, gloomy, horrible, unfriendly) |
| minacious(adjective, critical, forbidding, threat, denunciatory) |
| minatory(adjective, critical, forbidding, threat, denunciatory) |
| dire(adjective, tough, difficult, shocking, black) |
| frightening(adjective, person, strong, severe, intense) |
| impending(verb, adjective, bad, critical, likely) |
| ugly(adjective, person, bad, tough, severe) |
| baleful(adjective, critical, black, threatening, injurious) |
| gloomy(adjective, dark, unpleasant, horrible, unfriendly) |
| intimidating |
| looming(verb, adjective, critical, likely, possible) |
| formidable(adjective, bad, tough, severe, unpleasant) |
| inauspicious(adjective, black, baleful, bodeful) |
| creepy(adjective, nasty, black, scary, baleful) |