| baneful(adjective, help, unhealthy, dangerous, injurious) |
| deadly(adjective, help, unhealthy, harmful, dangerous) |
| noxious(adjective, help, unhealthy, dangerous, injurious) |
| pernicious(adjective, help, bad, unhealthy, dangerous) |
| fatal(adjective, dangerous, deadly, lethal) |
| pestiferous(adjective, harmful, dangerous, fatal, poisonous) |
| pestilential(adjective, help, unhealthy, dangerous, deadly) |
| poisonous(adjective, unhealthy, harmful, deadly, fatal) |
| malignant(adjective, help, unhealthy, lethal) |
| lethal(adjective, harmful, dangerous, deadly, fatal) |
| deathly(adjective, lethal) |
| harmful(adjective, unhealthy, dangerous, fatal, unwholesome) |
| mortal(adjective, dangerous, deadly, lethal) |
| unhealthy(adjective, unhealthy, harmful, diseased, unwholesome) |
| virulent(adjective, help, unhealthy, deadly, fatal) |
| infectious(adjective, dangerous, catching, spreading, transferable) |
| bothersome |
| deleterious(adjective, harmful, dangerous, fatal, poisonous) |
| galling |
| hurtful(adjective, harmful, poisonous, toxic) |