1
: free from harm, liability, or loss
2
: lacking capacity or intent to injure : innocuous
a harmless joke
harmlessly
adverb
harmlessness
noun
Synonyms
Examples of harmless in a Sentence
His ideas seem harmless enough.
We're just having a bit of harmless fun.
It was just a harmless joke.
Recent Examples on the Web
In an allergy, immunoglobulin E (IgE) specific to allergens (normally harmless substances that trigger an immune response in some people) may be detected in the blood.
—
Amber J. Tresca, Verywell Health, 31 Jan. 2025
Bubbly urine, which may occur from urinating quickly or forcefully, is harmless.
—Heidi Cope, Health, 28 Jan. 2025
Some are harmless to humans, whereas others are venomous.
—Allison Parshall, Scientific American, 28 Jan. 2025
These deposits are caused by a buildup of cholesterol or other fats and are generally harmless.
—Gordon G. Chang, Newsweek, 24 Jan. 2025
See all Example Sentences for harmless 
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Amber J. Tresca, Verywell Health, 31 Jan. 2025
Bubbly urine, which may occur from urinating quickly or forcefully, is harmless.
—Heidi Cope, Health, 28 Jan. 2025
Some are harmless to humans, whereas others are venomous.
—Allison Parshall, Scientific American, 28 Jan. 2025
These deposits are caused by a buildup of cholesterol or other fats and are generally harmless.
—Gordon G. Chang, Newsweek, 24 Jan. 2025
See all Example Sentences for harmless
Dictionary Entries Near harmless
Cite this Entry
“Harmless.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/harmless. Accessed 4 Feb. 2025.
Copy CitationKids Definition
harmless
adjective
harm·less
ˈhärm-ləs 
1
: free from harm
2
: unable to harm
harmlessly
adverb
harmlessness
noun
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