1
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

Relevance

Antonyms & Near Antonyms

2
3

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 Russell allegedly hatched the plot to black out Baltimore while, according to prosecutors, participating in a noxious, prolific propaganda network hellbent on fomenting violence and chaos. Ali Winston, WIRED, 29 Jan. 2025 Diffuse noxious inhibitory control (DNIC) theory: DNIC theory is based on the idea that creating pain in one area will relieve pain in another. Sherri Gordon, Health, 29 Jan. 2025 More North Carolina residents are finding themselves neighbors to massive poultry farms that produce odors, noxious dust and hundreds of tons of manure. Ames Alexander, Charlotte Observer, 26 Jan. 2025 The core Trump economic theme which shares so much DNA with old-school liberalism is buried underneath a noxious layer of hatred, lawlessness, violence, lying, and incoherence. John Yoo and John Shu, Newsweek, 23 Jan. 2025 See All Example Sentences for noxious
Recent Examples of Synonyms for noxious
Adjective
  • Shauna, Van, and Akilah break free from the rest of the group and end up in a tunnel permeated by some sort of poisonous gas.
    Esther Zuckerman, New York Times, 21 Feb. 2025
  • But perhaps more alarmingly, Seneca Meadows is currently sending poisonous, PFAS-laden runoff into the Hudson and your drinking water supply.
    Yvonne Taylor, New York Daily News, 21 Feb. 2025
Adjective
  • Studies have shown that testers can harbor harmful bacteria, including Staphylococcus aureus (a common cause of styes and other infections), E. coli, yeast, and mold.
    Mark Joseph, Newsweek, 24 Feb. 2025
  • Organic farms use natural farming methods to keep the soil, water, and environment free from potentially harmful chemicals.7 Similarities Grass-fed and organic foods share a commitment to natural farming.
    Chelsea Rae Bourgeois, RDN, LD, Health, 24 Feb. 2025
Adjective
  • The desire to avoid portraying her character’s actions as simply disgusting led de Van to play the lead role herself, in spite of the challenges that created for her as a first-time feature director.
    Jim Hemphill, IndieWire, 27 Feb. 2025
  • Selena Gomez has called out 'disgusting' weight shame As a former child star who grew up in the public eye, Gomez has long been subjected to conversations surrounding her weight.
    Jay Stahl, USA TODAY, 27 Feb. 2025
Adjective
  • Comments were largely supportive of the OP’s decision and rationale, with many noting that no one should feel guilty for protecting themselves from toxic people and behavior.
    Toria Sheffield, People.com, 22 Feb. 2025
  • In addressing allegations of toxic work environment on The Bachelor franchise run by his clients, Weinstein referenced the recent the scrapping of The Bachelorette’s 2025 season.
    Peter White, Deadline, 21 Feb. 2025
Adjective
  • And maybe keep them away from a dangerous young Pistons team in the first round.
    Mike Lupica, New York Daily News, 1 Mar. 2025
  • Tale of the Tape Texas Tech is a dangerous squad from deep and the Red Raiders aren’t shy at taking 3-pointers, ranking No. 93 in 3-point rate.
    Shreyas Laddha, Kansas City Star, 1 Mar. 2025
Adjective
  • Or the constitutional dystopia in which we are now caught, beside which even the ugliest onscreen villainy pales into insignificance?
    Justin Chang, The New Yorker, 28 Feb. 2025
  • The advanced metrics paint an ugly picture for the Suns as well over that span: 114.0 OffRtg (11th), 117.3 DefRtg (27th), -3.2 NetRtg (21st).
    Evan Sidery, Forbes, 28 Feb. 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
  • Sitting for too long can lead to a host of adverse health effects, but taking short movement breaks throughout the day can offset these risks.
    Elizabeth Yuko, Health, 12 Feb. 2025
  • Some such adverse impacts include difficulty driving or with close-up activities like reading, writing, cooking, sewing or fixing things around the house.
    Daryl Austin, USA TODAY, 12 Feb. 2025

Browse Nearby Words

Cite this Entry

“Noxious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/noxious. Accessed 4 Mar. 2025.

More from Merriam-Webster on noxious

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!