| formidable(adjective, tough, awful, terrible, fear) |
| dire(adjective, tough, difficult, awful, terrible) |
| fearful(adjective, tough, difficult, awful, terrible) |
| gruesome(adjective, awful, terrible, dreadful) |
| appalling(adjective, tough, difficult, awful, terrible) |
| terrible(adjective, tough, difficult, awful, fear) |
| ghastly(adjective, awful, terrible, fear, dreadful) |
| dreadful(adjective, tough, difficult, awful, terrible) |
| frightful(adjective, tough, difficult, awful, terrible) |
| horrible(adjective, tough, difficult, awful, terrible) |
| horrid(adjective, fear) |
| horrific(adjective, tough, difficult, awful, terrible) |
| direful(adjective, fear) |
| awful(tough, difficult, terrible, fear, dreadful) |
| illustrious(adjective, respect, knowledge) |
| tremendous(adjective, tough, difficult, awful, terrible) |
| dread |
| grim(awful, terrible, dreadful, ominous) |
| grisly(awful, terrible, strange, dreadful, horrifying) |
| horrendous(adjective, awful, terrible, dreadful) |