| hellish(adjective, awful, terrible, horrible, afraid) |
| helluva(adjective, awful, terrible, horrible, afraid) |
| hideous(adjective, awful, terrible, horrible, afraid) |
| horrendous(adjective, awful, terrible, horrible, afraid) |
| horrible(adjective, awful, terrible, afraid) |
| horrid(adjective, awful, terrible, horrible, afraid) |
| howling(adjective, awful, terrible, horrible, afraid) |
| immane(adjective, awful, terrible, horrible, afraid) |
| implanted |
| inbred(adjective, fixed, persistent, hardened, lasting) |
| incorrigible(adjective, established, hardened, confirmed, inveterate) |
| incurable(adjective, fixed, persistent, hardened, lasting) |
| long-lasting |
| long-term |
| miserable(adjective, awful, terrible, horrible, afraid) |
| monotonous(adjective, regular, persistent, continuous, endless) |
| monstrous(adjective, awful, terrible, horrible, afraid) |
| morbid(adjective, awful, terrible, horrible, afraid) |
| nasty(adjective, awful, terrible, horrible, afraid) |
| obstinate(adjective, persistent, continuous, hardened, lasting) |