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as in poisonous
bad for the well-being of the body mixing bleach and ammonia can cause noxious fumes that can seriously harm you

Synonyms & Similar Words

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Synonym Chooser

How is the word noxious different from other adjectives like it?

Some common synonyms of noxious are baneful, deleterious, detrimental, and pernicious. While all these words mean "exceedingly harmful," noxious applies to what is both offensive and injurious to the health of a body or mind.

noxious chemical fumes

When is it sensible to use baneful instead of noxious?

The words baneful and noxious can be used in similar contexts, but baneful implies injury through poisoning or destroying.

the baneful notion that discipline destroys creativity

When would deleterious be a good substitute for noxious?

In some situations, the words deleterious and noxious are roughly equivalent. However, deleterious applies to what has an often unsuspected harmful effect.

a diet found to have deleterious effects

When could detrimental be used to replace noxious?

While the synonyms detrimental and noxious are close in meaning, detrimental implies obvious harmfulness to something specified.

the detrimental effects of excessive drinking

When might pernicious be a better fit than noxious?

The meanings of pernicious and noxious largely overlap; however, pernicious implies irreparable harm done through evil or insidious corrupting or undermining.

the claim that pornography has a pernicious effect on society

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of noxious Their method could process the waste into something useful rather than noxious — hydrogen and protein. Paul Smaglik, Discover Magazine, 20 Mar. 2025 Much like today, noxious smells were also reminders of bodily decay. Andrew Paul, Popular Science, 14 Feb. 2025 The plaintiffs ask the court to require the defendants to stop operations at the site until the noxious odors and emissions are eliminated. Penny Weaver, arkansasonline.com, 2 Jan. 2025 The same goes for anti-fans; their dislike can turn noxious, and creators within this genre who attract their own devotees risk perpetuating the cycle. Shirley Li, The Atlantic, 2 Mar. 2025 See All Example Sentences for noxious
Recent Examples of Synonyms for noxious
Adjective
  • The editorial didn’t advise how to overcome tribal hatred and instead focused on the poisonous news of today — disruption and disorder in town halls and political vandalism of Tesla cars.
    Chicago Tribune, Chicago Tribune, 1 Apr. 2025
  • The machine fed the Southern identity a poisonous diet for three decades.
    Peter Greene, Forbes.com, 1 Apr. 2025
Adjective
  • Our biochemical response to that type of stress is to release cortisol which eventually leads to the harmful downstream effects on our bodies, such as high blood pressure.
    Andrea Kane, CNN Money, 1 Apr. 2025
  • Make sure to not add dyes or sweeteners, which can be harmful to hummingbirds.
    Claire Hoppe Norgaard, Better Homes & Gardens, 1 Apr. 2025
Adjective
  • Do not tell the patient disgusting hospital stories about your own operations or procedures.
    Marla Jo Fisher, Oc Register, 2 Apr. 2025
  • Using that platform to engage in partisan attacks and accuse former Department leadership of weaponizing law enforcement is a disgusting betrayal of those values.
    Mark Davis, Newsweek, 14 Mar. 2025
Adjective
  • In lieu of discussions of who is best for the role artistically, the question becomes who will sell more tickets (Ivy has 3 million followers but TikTok influencers rally around Chloe) and create a less toxic workplace.
    Christian Lewis, Variety, 11 Apr. 2025
  • Hacks follows the hilariously toxic relationship between Deborah Vance (Jean Smart), a legendary Las Vegas comedian trying to stage a comeback, and Ava Daniels (Hannah Einbinder), a younger sad sack comedy writer.
    Rudie Obias, HollywoodReporter, 10 Apr. 2025
Adjective
  • That means the garden isn't dangerous for Cummings' elderly father, who is allergic to bees.
    Martha Ann Overland, NPR, 6 Apr. 2025
  • Many of the surf zone fatalities occur when distant hurricanes send swells to shore that create dangerous conditions at the coast, such as strong surf and rip currents, the hurricane center stated.
    Dinah Voyles Pulver, USA Today, 6 Apr. 2025
Adjective
  • The first outcome would be a massive win for the United States, while the second would likely be far uglier.
    Michael Khouw, CNBC, 3 Apr. 2025
  • That pollution causes an ugly brown smog to blanket the skyline on hot summer days and causes people, especially those with respiratory problems, to struggle to breathe.
    Noelle Phillips, Denver Post, 3 Apr. 2025
Adjective
  • The unhealthful effects of autocracy remain robust even when accounting for economic differences and when excluding Venezuela and its collapsing health-care system.
    Thomas J. Bollyky, Foreign Affairs, 30 Jan. 2020
  • However, communities in the San Gabriel and San Bernardino mountains were still experiencing unhealthful air quality, according to the air district.
    Tony Briscoe, Los Angeles Times, 14 Sep. 2024
Adjective
  • And while the metal is usually excreted from the body, and most people experience no adverse side effects, previous research has shown some gadolinium particles have been left behind.
    John W. Dean, MSNBC Newsweek, 7 Apr. 2025
  • The foreign material could pose serious adverse health consequences, leading the FSIS to consider the recall a Class I—the agency's highest level of alert.
    Abigail Wilt, Southern Living, 7 Apr. 2025

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Cite this Entry

“Noxious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/noxious. Accessed 14 Apr. 2025.

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