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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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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 By the way, this is the playbook used by the noxious dictatorships that Trump so admires. Steven Greenhut, Orange County Register, 2 Mar. 2025 Their method could process the waste into something useful rather than noxious — hydrogen and protein. Paul Smaglik, Discover Magazine, 20 Mar. 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 No sunlight ever penetrated its depths, and the air is a noxious brew of toxic gases. Scott Travers, Forbes, 2 Mar. 2025 See All Example Sentences for noxious
Recent Examples of Synonyms for noxious
Adjective
  • Though gorgeous with color, azaleas are poisonous to animals and humans when ingested.
    Ashlyn Needham, Southern Living, 8 Apr. 2025
  • Every part of the pong pong tree is poisonous, but the leaves and barks aren’t as potent as the seeds.
    Angela Haupt, Time, 7 Apr. 2025
Adjective
  • The debate over the law centers on balancing accountability for harmful content with the risks of censorship and stifled innovation.
    Daryl Lim, The Conversation, 9 Apr. 2025
  • Shiny and minty, these balms provide a gloss-like effect while protecting your lips from the sun’s harmful rays.
    Jillian Dara, Travel + Leisure, 9 Apr. 2025
Adjective
  • These were disgusting, irresponsible comments by someone who is charged with overseeing public health for hundreds of millions of people.
    Thomas G. Moukawsher, MSNBC Newsweek, 17 Apr. 2025
  • Do not tell the patient disgusting hospital stories about your own operations or procedures.
    Marla Jo Fisher, Oc Register, 2 Apr. 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
  • Oddsmakers, however, still expect the Gators to handle a dangerous Maryland team coming off a thrilling win over Colorado State.
    Kevin Sabet, Newsweek, 24 Mar. 2025
  • For the beach hazards statement, NWS meteorologists warned that a moderate swell would create dangerous conditions from south of Monterey to south of Point Reyes, encompassing roughly 270 miles of California shoreline.
    Kevin Sabet, Newsweek, 24 Mar. 2025
Adjective
  • Everyone knew it, especially when some San Francisco Giants batters took ugly hacks against it in the first inning.
    Matt Gelb, New York Times, 18 Apr. 2025
  • Win that one, too, of course, and the No. 1-seed Cleveland Cavaliers and the best record in the NBA Eastern Conference would await to very likely only elongate the end for this Heat season and end it ugly. Do not expect a play-in to the Finals miracle run like Miami pulled off two years ago.
    Greg Cote, Miami Herald, 17 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
  • 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
  • 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

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Cite this Entry

“Noxious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/noxious. Accessed 20 Apr. 2025.

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