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

Security researchers at Malwarebytes are warning about a personalized text scam that uses fabricated Facebook Marketplace listings with the recipient's name as the seller. — Kurt Knutsson, FOXNews.com, 13 Oct. 2026

In February, the IMF separately warned that Beijing’s state subsidies were producing inefficient firms, with total subsidies amounting to some 4% of GDP. — Brendan Ruberry, semafor.com, 13 Oct. 2026

Jim referenced prominent investor Paul Tudor Jones, who warned on CNBC that 2027 might be a challenging year for the market. — Natasha Abellard, CNBC, 13 Oct. 2026

My parole attorney, Heidi Rummel, warned me that filming a documentary could work against me. — The New Yorker, New Yorker, 13 Oct. 2026