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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 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 And, of course, the terrible, unfair, unremitting pressure on actresses to comply with unrealistic Hollywood beauty standards that nourish that noxious need. Valerie Monroe, Allure, 21 Feb. 2025 See All Example Sentences for noxious
Recent Examples of Synonyms for noxious
Adjective
  • But Palpatine's genius is less about those poisonous whispers than his plot to isolate Anakin from his friends.
    Richard Edwards, Space.com, 24 Apr. 2025
  • The Big Bay Boom fireworks create a toxic fog of fine particles, poisonous aerosols and heavy metals that harm air, water and soil — posing serious risks to birds, wildlife, pets and people.
    U T Readers, San Diego Union-Tribune, 22 Apr. 2025
Adjective
  • For every person who happily sets 4:00 a.m. alarms on race morning, there’s another convinced the sport is too hard, too boring, or a waste of time, if not outright harmful.
    Cindy Kuzma, SELF, 25 Apr. 2025
  • Confusing a congressional edict to end segregation with DEI policies that have no genesis in the Black Civil Rights movement to end Jim Crow is historically ignorant, disrespectful, and harmful to the urgent need to focus on resolving continuing racial inequalities in public education.
    Raymond Pierce, Forbes.com, 25 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
  • Green 1 and 2: Both banned in 1965 due to a potential link to cancer. Sudan 1 and Butter Yellow: Banned in 1919 after it was found to be toxic and potentially carcinogenic.
    Mary Walrath-Holdridge, USA Today, 24 Apr. 2025
  • However, two new studies suggest that mattresses firm enough for a child to sleep on safely may emit toxic chemicals that previous research indicates are linked to developmental delays and endocrine system disruptions.
    Beth Ann Mayer, Parents, 23 Apr. 2025
Adjective
  • Prioritising one competition in favour of another is a dangerous game to play in any case when the stakes are so high.
    Mark Critchley, New York Times, 19 Apr. 2025
  • The most immediate context for this comment is presumably both the backlash to Hogwarts Legacy and the ongoing backlash over Rowling’s views writ large regarding trans women being dangerous predators.
    Aja Romano, Vox, 18 Apr. 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
  • So far, Lilly said the adverse effects of its new pill are consistent with GLP-1s, a class of medications primarily used to treat type 2 diabetes.
    Jonathan Limehouse, USA Today, 18 Apr. 2025
  • In the study, the researchers measured patients’ impulse control behavior disorders, excessive daytime sleepiness, blood pressure changes and weight changes, and found that the adverse effects linked to tavapadon were no different from those who received a placebo.
    Melissa Rudy, FOXNews.com, 18 Apr. 2025

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Cite this Entry

“Noxious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/noxious. Accessed 1 May. 2025.

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