12
poison(noun, adjective, help, substance, death)
10
poisonous(adjective, help, harmful)
9
toxic(adjective, help, poisonous)
9
venomous(adjective, help, hateful, poisonous)
8
virulent(adjective, help, poisonous, lethal)
6
deadly(adjective, poisonous)
4
baneful(adjective, poisonous)
4
destructive(adjective, poisonous)
4
malignant(adjective, poisonous)
4
toxin(noun, poison)
4
venom
3
mephitic(adjective, help, poisonous)
3
mephitical(adjective, help, poisonous)
3
noxious(adjective, poisonous)
3
vicious(adjective, poisonous)
2
poisonous substance(noun, expression, idiom)
2
bad(adjective, informal, poisonous)
2
bane
2
contagious
2
dangerous(adjective, poisonous)
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APASmart Define. (2015). toxicant thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/toxicant/thesaurus/synonyms
ChicagoSmart Define. 2015. "toxicant thesaurus" https://smartdefine.org/toxicant/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, toxicant thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/toxicant/thesaurus/synonyms>.
MLASmart Define. "toxicant thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/toxicant/thesaurus/synonyms>