| harmful(adjective, severe, offensive, awful) |
| critical(adjective, great, heavy, important) |
| serious(adjective, help, great, severe) |
| poisonous(adjective, offensive, violent, wild) |
| destructive(adjective, harmful, deadly, fatal) |
| severe(adjective, help, hard, tough) |
| nasty(adjective, hard, rough, offensive) |
| parlous(adjective, heavy, striking, risky) |
| ugly(adjective, hard, tough, severe) |
| pernicious(adjective, offensive, foul, disgusting) |
| vulnerable(adjective, delicate, heavy, uncertain) |
| baleful(adjective, critical, injurious, forbidding) |
| deadly(adjective, heavy, foul, harmful) |
| injurious(adjective, severe, offensive, awful) |
| deleterious(adjective, offensive, foul, harmful) |
| noxious(adjective, evil, offensive, cruel) |
| damaging(adjective, tough, evil, offensive) |
| alarming(adjective, menacing, intimidating, hazardous) |
| breakneck(adjective, heavy, risky, impetuous) |
| lethal(adjective, rotten, deadly, fatal) |