| alarming | |
| dire | |
| direful | |
| dread | |
| dreadful | |
| fearful | |
| fearsome | |
| forbidding | |
| foreboding | |
| formidable | |
| frightening | |
| hair-raising | |
| horrendous | |
| horrible | |
| horrifying | |
| intimidating | |
| redoubtable | |
| shocking | |
| spine-chilling | |
| terrible | |
| terrifying | |
| daunting | |
| demoralizing | |
| disconcerting | |
| discouraging | |
| dismaying | |
| disquieting | |
| distressing | |
| disturbing | |
| perturbing | |
| startling | |
| threatening | |
| troubling | |
| trying | |
| unnerving | |
| atrocious | |
| awful | |
| dreadful | |
| frightful | |
| ghastly | |
| grisline | |
| gruesome | |
| hideous | |
| horrid | |
| monstrosity | |
| repulsive | |