Lethal
Lethal adjective - Likely to cause or capable of causing death.
Usage example: we were lucky that the snake's venom wasn't lethal, and our friend turned out to be all right
Toxic is a synonym for lethal in poisonous topic. In some cases you can use "Toxic" instead an adjective "Lethal".
Nearby Word: lethality
Toxic
Mutual synonyms
Both words in one sentence
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To the vast majority of animals, the sap of the eucalyptus tree is toxic and lethal to ingest.
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It's also moderately toxic (the lethal dose for an average human is ~50g), so it's just a matter of choosing a lesser evil.
Source: Lite Crème -
It is also highly toxic and can (and does, though its use is controversial) serve as an incredibly lethal firebomb.
Source: Technicolor Science
Cite this Source
Toxic and Lethal. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/lethal/toxic
Lethal & Toxic. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/lethal/toxic>.
Toxic or Lethal. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/lethal/toxic.
Google Ngram Viewer shows how "lethal" and "toxic" have occurred on timeline