1
as in poisonous
bad for the well-being of the body
mixing bleach and ammonia can cause noxious fumes that can seriously harm you
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2
as in harmful
causing or capable of causing harm
noxious smog that for years has been encrusting the historic cathedral with soot
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3
as in disgusting
causing intense displeasure, disgust, or resentment
the website reserved the right to remove and report hate speech and other noxious types of postings
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Recent Examples of noxious
In confidential reports submitted to NASA, flight crews describe being overwhelmed by noxious fumes — struggling to stay conscious, land planes safely, or simply breathe — part of a larger body of evidence suggesting that contaminated cabin air is a recurring threat.
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Charlotte Observer, 29 Oct. 2025
Here, much to the amazement of onlookers, sacrificial animals such as bulls would drop dead after breathing in noxious carbon dioxide fumes swirling up from below.
—Barry Neild, CNN Money, 27 Oct. 2025
In Olympia, Riefenstahl translates these noxious ideas to film, almost verbatim.
—Sally Jenkins, The Atlantic, 27 Oct. 2025
Posts with fancy charts can contain noxious misinformation.
—Nadav Ziv, Time, 23 Oct. 2025
See All Example Sentences for noxious
Recent Examples of Synonyms for noxious
Adjective
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Anyone who may have eaten a poisonous mushroom is urged to seek medical help immediately.—
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Traces of plant toxins The chemical residues of this poisonous plant were found on 60,000-year-old quartz arrowheads.—
Adjective
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Some harmful varieties closely resemble edible mushrooms, even to experienced foragers.—
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On each phone, the lock screen image was a photo of a child who died young due to the harmful effects of social media.—
Adjective
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The medical ordeals are traumatic and disgusting, but fascinating and full of the quirks of modern life.—
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Having snow, slush, and (eventually) water all over my floors was a disgusting feeling.—
Adjective
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They’re combined with a non-toxic, hypoallergenic down alternative filling, creating a plush and luxurious sleeping experience that’s designed for back, side, and stomach sleepers.—
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Many hominids went extinct during this period, and being able to consume alcohol without adverse and/or toxic effects would have conferred a survival advantage.—
Adjective
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Pipes and sewers can be very dangerous for pets and wildlife and Roto-Rooter, with specialized equipment and personnel, has become a go-to call to save cats, dogs, turtles and more.—
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Ole Miss has enough dangerous weapons in quarterback Trinidad Chambliss, running back Kewan Lacy and wide receivers Harrison Wallace III, De’Zhaun Stribling and Deuce Alexander to make a tired defense pay.—
Adjective
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Not because the moms themselves are toxic people, but because the dynamic shifts into an ugly place with mean-girl behavior.—
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Sure, coach Mike Tomlin's teams tend to win ugly games, but not in the playoffs — at least not lately.—
Adjective
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The change comes amid concerns about fireworks causing unhealthful air.—
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Health professionals encourage people to use lean cuts of meat because most of the fat in animal products is unhealthful saturated fat, which can raise the risk of heart disease and cancer.—
Adjective
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Public systems can be somewhat risk adverse.—
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Nekrasov said adverse weather conditions also left parts of several other regions without power, including Chernihiv, Kyiv, Ivano-Frankivsk and Zakarpattia.—
Cite this Entry
“Noxious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/noxious. Accessed 12 Jan. 2026.
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