| appalling(nasty, unpleasant, awful, terrible, unkind) |
| eerie(nasty, unpleasant, awful, terrible, unkind) |
| gruesome(nasty, unpleasant, awful, terrible, unkind) |
| macabre(adjective, awful, terrible, dreadful) |
| unearthly(awful, terrible, strange, dreadful, horrifying) |
| baleful(awful, terrible, strange, dreadful, horrifying) |
| dire(awful, terrible, dreadful) |
| forbidding |
| foul |
| gargantuan |
| ghoulish(awful, terrible, dreadful) |
| grim(nasty, unpleasant, awful, terrible, unkind) |
| hideous(nasty, unpleasant, awful, terrible, unkind) |
| horrendous(awful, terrible, dreadful, frightening, creepy) |
| menacing |
| morbid(awful, terrible, strange, dreadful, horrifying) |
| shocking(awful, terrible, dreadful, breathtaking, frightening) |
| sinister(awful, terrible, dreadful) |
| spine-chilling(shocking, breathtaking, frightening, creepy, chilling) |
| spine-tingling(shocking, breathtaking) |