Synonyms|470Antonyms|124|Broader|10Narrower|6Related|1.3k

87 entries under harmful topic. ×

5
catastrophic(adjective, dreadful, injurious, damaging)
5
ill(adjective, rude, vicious, wicked, hostile)
5
malefic(adjective, negative, grave, threatening)
4
negative(adjective, injurious, unfavorable, hurtful)
4
unfavorable(adjective, contrary, dreadful, threatening)
3
cataclysmic(adjective, dreadful, injurious, damaging)
3
hateful(adjective, mean, bad, evil, nasty)
3
iniquitous(adjective, bad, corrupt, immoral, distressing)
3
internecine(adjective, violent, cruel, injurious)
3
spiteful(adjective, mean, bad, evil, nasty)
3
unhealthful(adjective, offensive, foul, disgusting, unhealthy)
2
corrupting(distressing, injurious, damaging, destructive)
2
crippling(adjective, injurious, damaging, destructive)
2
cutthroat(adjective, injurious, damaging, deadly)
2
distressing(cruel, unkind, upsetting, damaging)
2
disturbing(adjective, threatening, menacing, unfavorable)
2
wrackful(adjective, injurious, damaging, deadly)
1
annihilative(adjective, injurious, damaging, deadly)
1
cancerous(adjective, injurious, damaging, deadly)
1
consumptive(adjective, injurious, damaging, deadly)
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APASmart Define. (2016). pernicious thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/pernicious/thesaurus/synonyms
ChicagoSmart Define. 2016. "pernicious thesaurus" https://smartdefine.org/pernicious/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, pernicious thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/pernicious/thesaurus/synonyms>.
MLASmart Define. "pernicious thesaurus" 24 March 2016. Web. 28 September 2026. <https://smartdefine.org/pernicious/thesaurus/synonyms>