Synonyms of warn

warn

verb

ˈwȯrn 

as in to alert

to give notice to beforehand especially of danger or risk

the lifeguard warned the boys that if they continued playing so rough, someone was sure to get hurt

Synonyms & Similar Words

• alert
• advise
• inform
• forewarn
• caution
• wake
• predict
• notify
• admonish
• forecast
• foretell
• apprise
• presage
• prophesy
• prognosticate
• tip (off)
• augur
• foreshadow
• portend
• harbinger
• bode
• forebode
• foretoken

Antonyms & Near Antonyms

• risk
• imperil

Example Sentences

Recent Examples of warn

The doctors’ group, Protect Young Fans, warns of the potential health risks posed by highly caffeinated drinks like Monster Energy, particularly to children and adolescents, citing a growing body of scientific research across the medical spectrum. — Daniel Libit, Sportico.com, 3 Sep. 2026

Still, some warned that this uptick did not mean Japan’s population decline was close to being reversed. — Marco Quiroz-Gutierrez, Fortune, 3 Sep. 2026

On Tuesday, Zelensky ominously warned airlines in Russia that the risks could continue. — Dasha Litvinova, Los Angeles Times, 3 Sep. 2026

Some Republicans are warning the convention could backfire in battleground races. — Joey Garrison, USA Today, 3 Sep. 2026