Poisonous
Poisonous adjective - Containing or contaminated with a substance capable of injuring or killing a living thing.
Usage example: some evil person was leaving out poisonous meat for neighborhood dogs to eat
Toxic is a synonym for poisonous in help topic. In some cases you can use "Toxic" instead the word "Poisonous" as an adjective or a noun, when it comes to topics like harmful. popular alternative
Mutual synonyms
Both words in one sentence
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For non-standard powers, there's the Recurring Character Toxzon whose power is over poisonous and toxic compounds, be they viruses or radioactive sludge or even crude oil.
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He implanted the gland of a poisonous salamander in himself, making his touch and even his breath toxic to others while giving himself some resistance to poison.
Source: Poisonous Person -
See also Poisonous Friend, who is "toxic" in a completely different way than a Toxic Friend, and The Corrupter, who has a different kind of bad influence.
Source: Toxic Friend Influence
Cite this Source
Toxic and Poisonous. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/poisonous/toxic
Poisonous & Toxic. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/poisonous/toxic>.
Toxic or Poisonous. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/poisonous/toxic.
Google Ngram Viewer shows how "poisonous" and "toxic" have occurred on timeline