noxious
Americanadjective
-
harmful or injurious to health or physical well-being.
noxious fumes.
- Synonyms:
- deleterious, detrimental, nocuous, unhealthy, unwholesome, hurtful
- Antonyms:
- harmless
-
morally harmful; corrupting; pernicious.
a noxious plan to spread dissension.
- Synonyms:
- corruptive
- Antonyms:
- harmless
adjective
-
poisonous or harmful
-
harmful to the mind or morals; corrupting
Other Word Forms
- noxiously adverb
- noxiousness noun
Etymology
Origin of noxious
1605–15; < Latin noxius harmful, hurtful, injurious, equivalent to nox ( a ) harm, hurt, injury (akin to nocēre to do harm, inflict injury; innocent ) + -ius -ious
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
"So, they can cope with higher levels of noxious irritants produced by cold exposure."
From Science Daily • Mar. 26, 2026
Garbus’ four-part docuseries exposes the family’s noxious dynamics to the klieg lights of public judgment, offering reportorial context to their expansive influence.
From Salon • Mar. 14, 2026
The "Black Summer" bushfires raged across Australia's eastern seaboard from late 2019 to early 2020, razing millions of hectares, destroying thousands of homes and blanketing cities in noxious smoke.
From Barron's • Jan. 9, 2026
Sereen Banna said the partners of Downtown LA Law Group called her “Erin Brockovich” for her work helping hundreds sue over noxious fumes spewing out of a landfill in northern Los Angeles County.
From Los Angeles Times • Dec. 31, 2025
"Treason is a noxious weed," Pycelle declared sol-emnly.
From "A Game of Thrones" by George R.R. Martin
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
