| malignant(adjective, mean, bad, evil, nasty) |
| noisome(adjective, bad, evil, offensive, immoral) |
| unhealthy(adjective, offensive, foul, disgusting, distressing) |
| unwholesome(adjective, offensive, foul, disgusting, unhealthy) |
| dangerous(adjective, bad, offensive, foul, harmful) |
| deadly(adjective, bad, evil, cruel, unkind) |
| disastrous(adjective, harmful, injurious, damaging, deadly) |
| malign(adjective, mean, bad, evil, nasty) |
| virulent(adjective, mean, bad, evil, nasty) |
| calamitous(adjective, harmful, injurious, damaging, deadly) |
| catastrophic(adjective, harmful, injurious, damaging, deadly) |
| lethal(adjective, bad, evil, harmful, injurious) |
| malicious(adjective, mean, bad, wrong, evil) |
| nocuous(adjective, cruel, negative, unkind, harmful) |
| not good |
| corrupt(adjective, evil, low, foul, vicious) |
| insalubrious(adjective, offensive, foul, disgusting, harmful) |
| unfavourable |
| venomous(adjective, mean, bad, evil, nasty) |
| fatal(adjective, bad, evil, harmful, injurious) |