| bad to the bone | |
| counterproductive | |
| cruel(unkind, upsetting, fatal, poisonous, lethal) | |
| disserviceable | |
| hateful(adjective, person, unfriendly) | |
| incendiary(adjective, injurious, damaging, destructive, hurtful) | |
| inopportune(adjective, damaging, disparaging, hurtful, detrimental) | |
| internecine(adjective, violent, cruel, injurious, damaging) | |
| invidious | |
| morbific | |
| mortal(adjective, bad, evil, dangerous, injurious) | |
| nefarious(bad, corrupt, immoral, sinful, injurious) | |
| precarious(adjective, risky, dangerous, unsafe) | |
| scathing | |
| septic | |
| serious(adjective, bad, offensive, foul, revolting) | |
| subversive(adjective, injurious, damaging, destructive, hurtful) | |
| undesireworthy(adjective, arouse bad feelings, arouse bad emotions) | |
| afflicting | |
| annihilative(adjective, injurious, damaging, deadly, fatal) |
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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> |