The phrase "be stuck on" means to be infatuated or deeply attached to something or someone. Its antonyms, therefore, would be words that signify a lack of interest or affection. These could include phrases like "be indifferent to," "be repelled by," "dislike," "be apathetic towards," "be cool towards," "be bored with," or simply "dislike." Instead of being stuck on something or someone, these antonyms suggest a level of disinterest or even dislike. It's important to note, however, that antonyms depend on the context in which they are used, and the use of these words may vary depending on the situation.