| noxious(adjective, help, bad, evil, foul) |
| pestiferous(adjective, bad, evil, harmful, injurious) |
| deadly(adjective, help, bad, evil, harmful) |
| baneful(adjective, help, bad, evil, harmful) |
| harmful(adjective, injurious, damaging, deadly, destructive) |
| pernicious(adjective, help, bad, evil, harmful) |
| pestilent(adjective, help, unhealthy, dangerous, deadly) |
| fatal(adjective, bad, evil, harmful, injurious) |
| toxic(adjective, bad, evil, harmful, injurious) |
| lethal(adjective, bad, evil, harmful, injurious) |
| poisonous(adjective, bad, foul, harmful, injurious) |
| malignant(adjective, help, unhealthy, deadly, diseased) |
| detrimental(adjective, bad, evil, harmful, injurious) |
| dangerous(offensive, foul, disgusting, fatal, noxious) |
| destructive(adjective, unhealthy, harmful, injurious, poisonous) |
| epidemic(noun, infectious) |
| troublesome(adjective, harmful, bothersome, worrisome) |
| deleterious(adjective, bad, evil, harmful, injurious) |
| infectious(adjective, catching, spreading) |
| noisome(adjective, bad, evil, offensive, foul) |