harmless

adjective

harm·​less ˈhärm-ləs 

1

: free from harm, liability, or loss

2

: lacking capacity or intent to injure : innocuous

a harmless joke

harmlessly adverb

harmlessness noun

Synonyms of harmless

• benign
• safe
• innocent
• innocuous
• inoffensive
• healthy

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

But experts warn that these small and seemingly harmless devices could bring huge risks to our planet, if not more consciously designed. —Amy O’Brien, Vogue, 24 Feb. 2026

Even seemingly harmless organic compounds from things like cooking meals, laundry detergent, lighting a candle, pets, and cleaning supplies can build up and irritate your airways, says Neil Kao, an allergist based in Greenville, South Carolina. —Nashia Baker, Martha Stewart, 19 Feb. 2026

Some of the new advice is relatively harmless. —Jordan D. Metzl, The Atlantic, 19 Feb. 2026

While gas itself is common and usually harmless, ongoing bloating or discomfort may be a sign your gut needs more time to adjust. —Morgan Pearson, Verywell Health, 16 Feb. 2026

Word History

First Known Use

13th century, in the meaning defined at sense 1

Kids Definition

harmless

adjective

harm·​less ˈhärm-ləs 

1

: free from harm

2

: unable to harm

harmlessly adverb

harmlessness noun

Legal Definition

harmless

adjective

harm·​less

1

: free from harm, liability, or loss

—often used in the phrase to hold harmless see also hold harmless

2

: lacking capacity or intent to injure

harmlessly adverb

harmlessness noun