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
Toxic is a synonym for noxious in poisonous topic. In some cases you can use "Toxic" instead an adjective "Noxious", when it comes to topics like deadly, harmful, putrid or toxic. popular alternative
Nearby Words: noxiousness, noxiously
Toxic
Toxic adjective - Containing or contaminated with a substance capable of injuring or killing a living thing.
Usage example: certain plants are toxic if eaten
Noxious is a synonym for toxic in poisonous topic. You can use "Noxious" instead an adjective "Toxic", if it concerns topics such as harmful, putrid or toxic. popular alternative
Mutual synonyms
Both words in one sentence
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The Doctor: Oh, a noxious infusion of Oriental leaves containing a high percentage of toxic acid.
Source: Spot of Tea -
He sometimes uses this as a combat technique, as anything stored in his stomach for a while becomes noxious enough to be toxic.
Source: Zombie Puke Attack -
Some species of termites do have a facial appendage called a "fontanellar gun" that sprays a noxious substance, though it's more of a toxic glue rather than acid.
Source: Western Animation / Antz
Cite this Source
Toxic and Noxious. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/noxious/toxic
Noxious & Toxic. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/noxious/toxic>.
Toxic or Noxious. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/noxious/toxic.
Google Ngram Viewer shows how "noxious" and "toxic" have occurred on timeline