23 warn synonyms include notify, alert, apprise, give notice, inform, tell, let someone know, make someone aware, and give fair warning to. Warn is a verb, and its antonyms are ignore and reassure. Here are some additional synonyms for "warn" with example sentences.
23 other ways to say warn.
I need to warn you urgently.
Please warn me if anything changes.
They warn travelers about potential dangers.