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
Noxious is a synonym for lethal in poisonous topic. In some cases you can use "Noxious" instead an adjective "Lethal", when it comes to topics like deadly, pernicious, causing disease.
Nearby Word: lethality
Noxious
Noxious adjective - Bad for the well-being of the body.
Usage example: mixing bleach and ammonia can cause noxious fumes that can seriously harm you
Lethal is a synonym for noxious in poisonous topic. You can use "Lethal" instead an adjective "Noxious", if it concerns topics such as pernicious, causing disease.
Nearby Words: noxiousness, noxiously
Mutual synonyms
Related pairs
Both words in one sentence
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Never mind biting; it could kill creatures with super-lethal poison just by looking them in the eyes, or when they inhale the noxious fumes it emanates.
Source: Walking Wasteland
Cite this Source
Noxious and Lethal. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/lethal/noxious
Lethal & Noxious. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/lethal/noxious>.
Noxious or Lethal. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/lethal/noxious.
Google Ngram Viewer shows how "lethal" and "noxious" have occurred on timeline