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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
Cleaning is a necessary part of life, an essential task that keeps us (and our families) safe from harmful germs and bacteria.
—Alyssa Shaffer, Better Homes & Gardens, 23 Nov. 2024
Third-party testing confirms that the supplement contains the ingredients listed on the label and is free from harmful contaminants.
—Barbie Cervoni, Health, 23 Nov. 2024
Just be sure never to mix vinegar with hydrogen peroxide, which can cause a harmful toxic gas if inhaled.
—Rebecca Jones, Southern Living, 23 Nov. 2024
Some companies have reportedly dealt with safety issues, like bad actors who abuse the model to give harmful advice or prey on vulnerable people.
—Jamie Ducharme, TIME, 22 Nov. 2024
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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 1 Dec. 2024.
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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