Antonyms for "loses one's heart to" can be found in words or phrases that describe detachment or the opposite of love. Some examples include "spurns," "disdainful," "apathetic," "indifferent," and "repelled." These words signify a lack of emotion or interest towards the subject in question, as opposed to the strong feelings of infatuation that come with "losing one's heart to" someone or something. Other antonyms might include words like "hate," "detest," or "reject," which imply a stark contrast to love or affection. Ultimately, antonyms for "loses one's heart to" will depend on the context of the sentence and the intended meaning.