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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 Missing this chance would mean even more noxious uses separating the harbor from adjacent communities, continuing to burden them with environmental harm. Tiffany-Ann Taylor, New York Daily News, 5 May 2025 Both Alito and Chief Justice John Roberts, meanwhile, appeared to think that there is something particularly noxious about exposing young people to books with gay characters. Ian Millhiser, Vox, 22 Apr. 2025 The lawsuit claims Eco-Vista has failed to prevent noxious odors and leachate from their trash disposal operation from invading the neighboring homes, interfering with the ability of residents to use and enjoy their homes and property and reducing property values in the area. Ron Wood, Arkansas Online, 22 Apr. 2025 These figures paint a disconcerting picture of the country’s efforts to combat noxious air quality, an ambition established with the original passage of the Clean Air Act in 1963 and reinforced by numerous amendments since. Henna Hundal, Forbes.com, 1 May 2025 See All Example Sentences for noxious
Recent Examples of Synonyms for noxious
Adjective
  • The attack, which only killed the bomber but could have been much worse, is an act worthy of perhaps the dumbest and most poisonous ideology on the planet right now.
    Rich Lowry, National Review, 19 May 2025
  • From such small radioactive acorns do poisonous oaks grow.
    Adam Gopnik, New Yorker, 19 May 2025
Adjective
  • China has gone even further, requiring digital watermarks on synthetic media and directing platforms to swiftly remove harmful content — part of its broader strategy of centralized content control.
    Anisha Sircar, Forbes.com, 30 May 2025
  • The jury is still out on whether emulsifiers are harmful to the gut.
    Fran Kritz, Verywell Health, 30 May 2025
Adjective
  • But unfortunately, that also means Big Mouth, the cartoon about all the disgusting, messy parts of growing up from Nick Kroll, must also conclude as well.
    Lucy Ford, Time, 19 May 2025
  • Donning silly British accents, Johansson joins Gardner, Fineman, and Sherman for a disgusting and messy meal.
    Andy Hoglund Updated, EW.com, 18 May 2025
Adjective
  • The explosion of money in the game in the past few years has made things only more toxic.
    Joe Rexrode, New York Times, 29 May 2025
  • As explained by Hill's Pet Nutrition, spicy food can be toxic for dogs and can lead to excessive thirst or even vomiting.
    Alyce Collins, MSNBC Newsweek, 29 May 2025
Adjective
  • The reason is that getting on and off a tall bed or sofa can be dangerous for your furry friend and result in potential injuries.
    Maria Sabella, Better Homes & Gardens, 24 May 2025
  • Mensah and Bharadwaj take dangerous risks exploring an unknown area while Gurathin confronts Murderbot.
    Billie Melissa, MSNBC Newsweek, 24 May 2025
Adjective
  • The birds' droppings end up on the ground and windows below, creating an ugly scene for staff, branch patrons and passersby walking in the River Market District.
    Joseph Flaherty, Arkansas Online, 23 May 2025
  • Compare the first half of Season 15 to Jodie Whittaker’s last outing as the Doctor, and things get uglier.
    Jake Kanter, Deadline, 23 May 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
  • In 2023, for example, a federal judge ruled that mifepristone should be taken off the market by citing low-quality studies that reported adverse effects from mifepristone.
    Keren Landman, The Atlantic, 24 May 2025
  • Those impacted by this recall or others can report a complaint or adverse event by visiting Industry and Consumer Assistance.
    Fernando Cervantes Jr, USA Today, 24 May 2025

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Cite this Entry

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

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