Warn, caution, admonish imply attempting to prevent another from running into danger or getting into unpleasant or undesirable circumstances. To warn is to speak plainly and usually in strong terms: to warn him about danger and possible penalties. A warning is something which is said or written to tell people of a possible danger, problem, or other unpleasant thing that might happen. The minister gave a warning that if war broke out, it would be catastrophic. He was killed because he ignored a warning to put stronger cords on his parachute. A warning is an advance notice of something that will happen, often something unpleasant or dangerous. The soldiers opened fire without warning. A warning is something that makes us aware of possible danger. There are a number of ways of warning someone. Warnings can be weak or strong. … A warning is something that makes us aware of possible danger. There are a number of ways of warning someone. Warnings can be weak or strong. … The meaning of WARNING is the act of warning : the state of being warned. How to use warning in a sentence. A warning is a caution against something dangerous. When there's a shark warning at the beach, the lifeguards will order everyone out of the water. When you receive a warning, you get an official advance notice of some impending problem. Synonyms for WARNING: caution, forewarning, alert, advice, recommendation, admonition, admonishment, suggestion; Antonyms of WARNING: permission, green light, OK, go-ahead, all clear, risking, imperiling Explanation A warning is a caution against something dangerous. When there's a shark warning at the beach, the lifeguards will order everyone out of the water. When you receive a warning, you get an official advance notice of some impending problem. Define warning. warning synonyms, warning pronunciation, warning translation, English dictionary definition of warning. n. 1. A statement telling of or an indication providing evidence of impending danger, difficulty, or misfortune: The government issued a warning about.