A secret admirer is a person who holds affectionate feelings for someone but prefers to keep their identity concealed. There can be numerous synonyms used for this term, depending on the nature of the feelings and the context of the situation. Some of the common synonyms of secret admirer are a crush, infatuated, love-struck, smitten, and infatuation. Other alternative expressions include a mystery lover, undercover sweetheart, hidden suitor, anonymous admirer, and a covert paramour. Regardless of the word used, these synonyms highlight the allure and mystique of a person's unspoken affection, making it an intriguing aspect of many literary works.