8
toxicity
4
harm(noun, damage, evil, destruction, injury)
4
harmfulness
3
injuriousness(noun, destruction, death, demise, pathology)
3
malignancy
3
sickness(noun, destruction, death, demise, pathology)
3
virulence
2
malignity(noun, evil, wickedness, malice, malevolence)
2
noxiousness(noun, wrong, damage, abuse, evil)
1
abuse(noun, wrong, damage, evil, loss)
1
bacteriology(noun, destruction, death, demise, pathology)
1
balefulness
1
banefulness(noun, wrong, damage, abuse, evil)
1
damage(noun, wrong, abuse, evil, harm)
1
deadliness(noun, destruction, death, demise, pathology)
1
deadness(noun, destruction, death, demise, pathology)
1
deleteriousness(noun, wrong, damage, abuse, evil)
1
detriment(noun, wrong, damage, abuse, evil)
1
disease(noun, destruction, death, demise, pathology)
1
disservice(noun, wrong, damage, abuse, evil)
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APASmart Define. (2015). perniciousness thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/perniciousness/thesaurus/synonyms
ChicagoSmart Define. 2015. "perniciousness thesaurus" https://smartdefine.org/perniciousness/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, perniciousness thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/perniciousness/thesaurus/synonyms>.
MLASmart Define. "perniciousness thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/perniciousness/thesaurus/synonyms>