| ferine(aper, demoniac, annihilative) |
| ferocious(aper, demoniac, annihilative) |
| fierce(aper, demoniac, annihilative) |
| grievous(adjective, heavy, acute, major, dangerous) |
| hazardous(adjective, heavy, acute, major, dangerous) |
| heavy(adjective, acute, dangerous, crucial) |
| inhuman(aper, demoniac, annihilative) |
| inhumane(aper, demoniac, annihilative) |
| lethiferous(aper, demoniac, annihilative) |
| life-and-death(adjective, heavy, acute, major, dangerous) |
| life and death(expression, idiom, grave, demoniac, pernicious) |
| major(adjective, heavy, acute, dangerous, crucial) |
| momentous(adjective, heavy, acute, dangerous, crucial) |
| murderous(grave, aper, demoniac, pernicious, annihilative) |
| no joke(expression, aper, demoniac, annihilative) |
| no laughing matter(expression, idiom, aper, demoniac, annihilative) |
| of consequence(expression, aper, demoniac, annihilative) |
| ominous(adjective, heavy, acute, major, dangerous) |
| out for blood(expression, idiom, aper, demoniac, annihilative) |
| perilous(adjective, heavy, acute, major, dangerous) |