- Definitions|2
- Thesaurus|1.9k
- Abbreviations|0
87 entries under harmful topic. ×
| prejudicial(adjective, bad, cruel, unkind) | |
| malevolent(adjective, mean, bad, evil, nasty) | |
| pestilent(adjective, help, bad, unhealthy) | |
| dangerous(adjective, bad, offensive, foul, disgusting) | |
| malign(adjective, mean, bad, evil, nasty) | |
| pestilential(adjective, help, bad, evil) | |
| sinister(adjective, bad, evil, nasty, negative) | |
| mischievous(adjective, mean, bad, nasty, cruel) | |
| pestiferous(adjective, bad, evil, injurious) | |
| wicked(adjective, mean, bad, evil, nasty) | |
| nocuous(adjective, cruel, unkind, distressing) | |
| venomous(adjective, mean, bad, evil, nasty) | |
| noisome(adjective, bad, evil, offensive, immoral) | |
| unwholesome(adjective, offensive, foul, disgusting, unhealthy) | |
| mortal(adjective, bad, evil, grave) | |
| vicious(adjective, mean, bad, evil, nasty) | |
| devastating(adjective, bad, evil, wicked, dreadful) | |
| disastrous(adjective, bad, wicked, immoral, dreadful) | |
| calamitous(adjective, bad, wicked, immoral, dreadful) | |
| insalubrious(adjective, offensive, foul, disgusting) |
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| APA | Smart Define. (2016). pernicious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/pernicious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "pernicious thesaurus" https://smartdefine.org/pernicious/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, pernicious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/pernicious/thesaurus/synonyms>. |
| MLA | Smart Define. "pernicious thesaurus" 24 March 2016. Web. 26 September 2026. <https://smartdefine.org/pernicious/thesaurus/synonyms> |