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Synonyms
Examples of harmful in a Sentence
DDT has been proven to be extremely harmful to the environment.
Recent Examples on the Web
Market intervention is always and everywhere harmful simply because markets are people.
—John Tamny, Forbes, 19 Jan. 2025
In an October 2022 article in the Montreal Gazette, Bryn Austin, a professor at Harvard T.H. Chan School of Public Health, highlighted how BMI can lead to harmful outcomes.
—David Faris, Newsweek, 19 Jan. 2025
And tests of raw products show that they are frequently contaminated with harmful viruses and bacteria such as salmonella and E. coli.
—Brenda Goodman, CNN, 18 Jan. 2025
Some women have expressed concern that the ERA could be more harmful than helpful.
—Jackson Walker, Baltimore Sun, 17 Jan. 2025
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Word History
First Known Use
14th century, in the meaning defined above
Time Traveler
The first known use of harmful was
in the 14th century
Dictionary Entries Near harmful
Cite this Entry
“Harmful.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/harmful. Accessed 22 Jan. 2025.
Kids Definition
Legal Definition
harmful
adjective
harm·ful
: of a kind likely to cause harm
harmfully
adverb
harmfulness
noun
More from Merriam-Webster on harmful
Nglish: Translation of harmful for Spanish Speakers
Britannica English: Translation of harmful for Arabic Speakers
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