Being sweet on someone is a colloquial phrase that refers to having a crush or romantic interest in someone. Antonyms for this expression include being cold, indifferent, uninterested or dispassionate towards someone. These words indicate a lack of attraction or affection towards a particular individual. Instead of admiring, cherishing or adoring someone, being cold or indifferent suggests a lack of emotional involvement or investment. When someone is dispassionate or uninterested in another person, it means that they have no feelings of warmth, fondness, or love towards them. These antonyms demonstrate the opposite feelings from being sweet on someone.