Premonishment refers to a warning or forewarning of something that is about to happen. Synonyms for premonishment include prophecy, forecast, prediction, portent, omen, foreboding, augury, sign, and harbinger. A prophecy is a declaration of something to come, usually divinely inspired. A forecast is a prediction of future events based on past and present data. A portent is a sign or indication of something momentous or calamitous about to happen. An omen is a superstition or sign that something good or bad is about to happen. A foreboding is a sense of impending doom or evil. An augury is a prediction or sign of what is to come. A sign is an omen or portent that something is about to happen. A harbinger is a person or thing that announces or signals the approach of another.