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
Poisonous is a synonym for lethal in deadly topic. In some cases you can use "Poisonous" instead an adjective "Lethal", when it comes to topics like property, causing disease. popular alternative
Nearby Word: lethality
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
Lethal is a synonym for poisonous in toxic topic. You can use "Lethal" instead an adjective "Poisonous", if it concerns topics such as property, deadly, harmful, causing disease. popular alternative
Mutual synonyms
Related pairs
Both words in one sentence
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The air in Blasted Tokyo is explicitly stated to be poisonous and lethal to humans, but you, Jonathan, and Walter can travel outdoors all day without the protective masks that the residents of Blasted Shinjuku wear, with no ill effect whatsoever.
- Mordor: The Skull Kingdom is a wreck, with a skull-faced mountain at its core, and is surrounded by poisonous rivers, lethal deserts, and a mountain range filled with poisonous spiders.
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The planet Elba II had a poisonous atmosphere that would kill humans breathing it before very long, "The Way to Eden" had a planet that was technically habitable (right sunlight and air quality), but all the flora excreted a deadly acid, and the fruit was lethal.
Source: All Planets Are Earth-Like
Cite this Source
Poisonous and Lethal. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/lethal/poisonous
Lethal & Poisonous. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/lethal/poisonous>.
Poisonous or Lethal. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/lethal/poisonous.
Google Ngram Viewer shows how "lethal" and "poisonous" have occurred on timeline