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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 No sunlight ever penetrated its depths, and the air is a noxious brew of toxic gases. Scott Travers, Forbes, 2 Mar. 2025 In the early 2000s, investigators documented a stew of noxious chemicals that remained at the factory property, among them 1,4-dioxane, which turned out to spread more widely than the other chemicals. Kevin Spear, Orlando Sentinel, 28 Feb. 2025 The show then positions him as a lowly subordinate to his rich half-siblings throughout the season, a choice made more noxious by how the script uses his working-class roots as the basis for jokes at his expense. Nicholas Quah, Vulture, 27 Feb. 2025 The vast majority of the victims died of asphyxiation, choking to death on the thick clouds of noxious gas and ash. Ars Technica, 27 Feb. 2025 See All Example Sentences for noxious
Recent Examples of Synonyms for noxious
Adjective
  • However, its seeds, flowers, and leaves are very poisonous.
    Clarence Schmidt, San Diego Union-Tribune, 12 Mar. 2025
  • While shooting the scene, the snake handlers identified which snakes by color were poisonous and told Goggins not to touch them.
    Lexi Carson, The Hollywood Reporter, 6 Mar. 2025
Adjective
  • This can be extremely harmful to the lungs of at-risk people, including children whose lungs are still developing, pregnant women, older adults and those with asthma, chronic obstructive pulmonary disease or diabetes, according to the American Lung Assn.
    Karen Garcia, Los Angeles Times, 20 Mar. 2025
  • Test results from Consumer Reports found potentially harmful chemicals in roughly half of the formula products.
    Geoff Harris, Baltimore Sun, 20 Mar. 2025
Adjective
  • 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
  • Continue reading … ‘PRO-CRIMINAL’ – Blue state sheriff unloads on 'disgusting' bill targeting the right to self-defense.
    Fox News, Fox News, 11 Mar. 2025
Adjective
  • The Netflix series delves into the pressures that young men face in a world of toxic masculinity and social media.
    Toria Sheffield, People.com, 29 Mar. 2025
  • Communities are rebuilding after L.A. fires despite the lack of soil testing for toxic substances.
    Ryan Fonseca, Los Angeles Times, 28 Mar. 2025
Adjective
  • Africa, where the World Health Organization has deemed skin bleaching a dangerous and common phenomenon, is no exception.
    Mankaprr Conteh, Rolling Stone, 23 Mar. 2025
  • Directed by John Carpenter, Escape from New York taps into the anxieties at the height of Cold War paranoia and urban decay fears, presenting a future where America’s own cities have become as dangerous as any foreign battlefield.
    Travis Bean, Forbes, 22 Mar. 2025
Adjective
  • This included industrialization, and, with it, the conception of leisure as a way of allowing people to recuperate from work with a temporary escape from the ugly, unhealthy atmosphere of the city.
    Livia Gershon, JSTOR Daily, 23 Mar. 2025
  • Four-time Tour de France winner Chris Froome had form on the bike that was frequently described as ugly.
    Liam Tharme, The Athletic, 23 Mar. 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 takeover offer will be subject to customary closing conditions including market and business-related material, adverse change clauses and regulatory approval.
    Jill Goldsmith, Deadline, 26 Mar. 2025
  • Marijuana can have broad adverse physical and mental health effects.
    Omer Awan, Forbes, 25 Mar. 2025

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Cite this Entry

“Noxious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/noxious. Accessed 3 Apr. 2025.

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