| formal(adjective, strong, cold, stiff, affected) |
| foul |
| freak(extraordinary, unusual, wild, strange, crazy) |
| frightening(awful, terrible, grim, shocking, upsetting) |
| gargantuan |
| ghastly(adjective, strange, shocking, odd, pale) |
| ghostlike(supernatural, weird, paranormal, spooky, mystic) |
| ghoulish(awful, terrible, grim, shocking, upsetting) |
| grim(awful, shocking, upsetting, frightening, horrifying) |
| grisly(awful, terrible, immoral, grim, shocking) |
| gruesome(awful, immoral, grim, shocking, atrocious) |
| hair-raising(shocking, upsetting, frightening) |
| hard(adjective, evil, nasty, harsh, vicious) |
| heteroclite(extraordinary, unusual, strange, exceptional, usual) |
| heteromorphic(extraordinary, strange, exceptional, irregular, nonstandard) |
| horrendous(awful, terrible, immoral, grim, shocking) |
| horrible(awful, immoral, grim, shocking, atrocious) |
| horrid(awful, terrible, grim, shocking, upsetting) |
| horrific(strange, immoral, shocking, odd, atrocious) |
| horrifying(awful, terrible, immoral, grim, shocking) |