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 agency warned that recent decrees had further weakened women’s legal protections. — Reuters, NBC news, 13 Aug. 2026

The mayor’s initial budget proposal last October recommended a smaller $121 million payment, but aldermen argued that amount was insufficient for the city’s troubled pension funds and warned that the smaller sum could trigger a credit downgrade. — Jake Sheridan, Chicago Tribune, 13 Aug. 2026

Central Indiana - including Indianapolis - remained under a flood threat through the evening as forecasters warned additional rounds of thunderstorms were capable of producing heavy rainfall and damaging winds. — Jen Guadarrama, IndyStar, 13 Aug. 2026

Jeannette runs off to warn her parents, while Denise smartly makes a couple of calls from a nearby pay phone. — Siddhant Adlakha, Vulture, 13 Aug. 2026