deleterious

adjective
del·​e·​te·​ri·​ous | \ ˌde-lə-ˈtir-ē-əs How to pronounce deleterious (audio) \

Definition of deleterious

: harmful often in a subtle or unexpected way deleterious effects deleterious to health

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Other Words from deleterious

deleteriously adverb
deleteriousness noun

Choose the Right Synonym for deleterious

pernicious, baneful, noxious, deleterious, detrimental mean exceedingly harmful. pernicious implies irreparable harm done through evil or insidious corrupting or undermining. the claim that pornography has a pernicious effect on society baneful implies injury through poisoning or destroying. the baneful notion that discipline destroys creativity noxious applies to what is both offensive and injurious to the health of a body or mind. noxious chemical fumes deleterious applies to what has an often unsuspected harmful effect. a diet found to have deleterious effects detrimental implies obvious harmfulness to something specified. the detrimental effects of excessive drinking

Examples of deleterious in a Sentence

In developing countries, the imposition of boundaries around national parks and protected areas has been deleterious for both people and wildlife. — Kristin B. Gunther, Association of American Geographers, 2002 Most everyone now knows the action of pressing mouse keys is far more deleterious to the tender structures of the wrist and hand than typing is. — Michael Finley, Albany (New York) Times-Union, 2 Sept. 1998 This skewed allocation of resources away from those most in need, in turn, insures that many young people from low-income families will continue to be shut out of the economy, with obvious deleterious family and social consequences. — Iris C. Rotberg, Education Week, 9 Mar. 1994 For as James Keirans pointed out to me, ticks are the world's most notorious carriers of the agents of diseases that strike animals, wild and domestic. And they rank second only to mosquitoes in their deleterious effect on humans. — Edwards Park, Smithsonian, January 1987 The chemical is deleterious to the environment. The drug has no deleterious effects on patients.
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Recent Examples on the Web

Areas of unspoiled natural beauty are shrinking — and the deleterious effects of climate change are becoming more and more disturbing. Vincent Andrunas, San Diego Union-Tribune, "A voice for the coast and ocean," 5 July 2019 This is how a taboo breaks down, with deleterious effects on due process for victims of rape and abuse, both in court and in everyday snap judgments. Josephine Livingstone, The New Republic, "The Death of Taboo," 27 June 2019 The basic premise is that reading predominantly from screens has deleterious effects on a person's brain, and, by extension, affects thoughts and actions. Nina Maclaughlin, BostonGlobe.com, "Amazon adventures, LAMBDA laureates, and local natives," 13 June 2019 Ohta argued that if population sizes are large enough, purifying selection will purge them of even slightly deleterious mutations. Quanta Magazine, "Theorists Debate How ‘Neutral’ Evolution Really Is," 8 Nov. 2018 In her new book Cribsheet, the economist Emily Oster writes that rumors of the deleterious effects of screen time have been greatly exaggerated. Laura Turner, Glamour, "The Big Problem With the New Screen Time Guidelines for Kids," 26 Apr. 2019 The customizable bedtime setting also tells the Forma when to bump up the orange light in the evening to prevent extra blue light from having a deleterious effect on your eyes and mind before sleep. Valentina Palladino, Ars Technica, "Kobo Forma review: A formidable opponent for Amazon’s Kindle Oasis," 22 Nov. 2018 Hippo poop is piling up in Tanzania’s freshwater fisheries—which is bad news for biodiversity, and deleterious for the dinnerplate. Jason G. Goldman, Scientific American, "Hippo Dung Fouls Up Freshwater Fisheries," 14 June 2018 Musk’s behavior this summer has compounded the deleterious effect of technical problems in late March and early April, including a deadly autopilot crash, a Model S recall and production target misses. Rani Molla, Recode, "Elon Musk’s summer of bad behavior hasn’t affected Tesla’s sales, but it has hurt its reputation," 10 Oct. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'deleterious.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of deleterious

1643, in the meaning defined above

History and Etymology for deleterious

Greek dēlētērios, from dēleisthai to hurt

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Dictionary Entries near deleterious

Delesseria

delete

delete key

deleterious

deletery

delethalize

deletion

Statistics for deleterious

Last Updated

11 Jul 2019

Look-up Popularity

Time Traveler for deleterious

The first known use of deleterious was in 1643

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More Definitions for deleterious

deleterious

adjective

English Language Learners Definition of deleterious

formal : damaging or harmful

deleterious

adjective
del·​e·​te·​ri·​ous | \ ˌdel-ə-ˈtir-ē-əs How to pronounce deleterious (audio) \

Medical Definition of deleterious

: harmful often in a subtle or an unexpected way the deleterious effects of radiation and chemotherapy on the marrow— Christine Gorman deleterious genes

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