| awful(adjective, bad, severe, offensive, terrible) | |
| cancerous(adjective, injurious, damaging, deadly, fatal) | |
| corrosive | |
| corruptive | |
| degrading(injurious, detrimental) | |
| depraved | |
| diabolic | |
| difficult(unpleasant, risky, dangerous, unsafe) | |
| dreadful | |
| extirpative(adjective, injurious, damaging, deadly, fatal) | |
| fateful(adjective, arouse bad emotions) | |
| fell(adjective, injurious, damaging, deadly, fatal) | |
| fiendish | |
| harassing(adjective, injurious, damaging, destructive, hurtful) | |
| iniquitous(bad, corrupt, immoral, distressing, sinful) | |
| life-threatening(adjective, dangerous) | |
| lousy(adjective, bad, offensive, foul, useless) | |
| mephitic(adjective, bad, evil, offensive, corrupt) | |
| murderous(adjective, bad, offensive, violent, foul) | |
| nocent(negative, distressing, injurious, damaging) |
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| APA | Smart Define. (2016). harmful thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/harmful/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "harmful thesaurus" https://smartdefine.org/harmful/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, harmful thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/harmful/thesaurus/synonyms>. |
| MLA | Smart Define. "harmful thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/harmful/thesaurus/synonyms> |