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

Critics warn that dramatic increases could force small businesses to reduce hiring, automate more jobs, or raise prices. — Doug Melville, Forbes.com, 24 July 2026

Joe Bowring, the independent monitor of the PJM market, has warned that capacity prices could stay high and argues that large loads like data centers should bring their own generation, rather than lean on infrastructure the rest of us pay for. — Melody Birmingham, Fortune, 23 July 2026

The letter, a copy of which Granger provided to Sportico, warned of legal and public relations consequences if the school failed to make amends. — Daniel Libit, Sportico.com, 23 July 2026

The county alleges the companies created a public nuisance and are liable under claims including negligence, design defect and failure to warn. — Reeti Malhotra july 23, Sacbee.com, 23 July 2026