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 United Nations’ World Meteorological Organization warned that the impending storm — driven by warming ocean temperatures — is projected to be one of the worst in recent years. — Lia Russell, Sacbee.com, 22 Sep. 2026

This comes as a growing number of lawmakers, former AI employees and even leaders at top AI companies have warned of the rapid growth of the industry. — Alejandra Jaramillo, CNN Money, 22 Sep. 2026

Warner warned us that our blacksmithing experience would not be a historical lesson, but rather a chance to learn by doing. — Sarah Wood González, Condé Nast Traveler, 21 Sep. 2026

This device not only warns you of incoming threats (similar to the radio static in previous games) but also gently nudges you in the right direction by showing a garbled feed of landmarks. — Zackery Cuevas, PC Magazine, 21 Sep. 2026