| formidable(adjective, bad, awful, terrible, rotten) |
| frightening(adjective, nasty, awful, terrible, horrible) |
| frightful(adjective, awful, terrible, horrible, dreadful) |
| ghastly(adjective, bad, awful, terrible, rotten) |
| ghoulish(adjective, nasty, awful, terrible, dreadful) |
| grievous(adjective, bad, awful, terrible, horrible) |
| grim(adjective, bad, awful, terrible, horrible) |
| grisly(adjective, awful, terrible, strange, dreadful) |
| gruesome(adjective, nasty, awful, terrible, dreadful) |
| hair-raising(adjective, nasty, awful, terrible, dreadful) |
| heinous(adjective, nasty, terrible, disgusting, vicious) |
| hideous(adjective, bad, awful, terrible, rotten) |
| horrendous(adjective, bad, awful, terrible, rotten) |
| horrid(adjective, nasty, terrible, disgusting, vicious) |
| horrific(adjective, bad, awful, terrible, rotten) |
| horrifying(adjective, awful, terrible, strange, dreadful) |
| infamous(adjective, nasty, terrible, disgusting, vicious) |
| insufferable(adjective, terrible, vile, horrible, odious) |
| intolerable(adjective, terrible, vile, horrible, odious) |
| invidious(adjective, nasty, terrible, disgusting, vicious) |