Antonyms for the phrase "is nuts about" include words like "dislike," "hate," "loathe," "abhor," "detest," and "despise." While being nuts about something denotes a great affection or enthusiasm towards a person, activity, or idea, its antonyms, on the other hand, express a strong aversion or opposition towards the same. For instance, instead of saying "he is nuts about classical music," one could say "he despises classical music." Therefore, knowing antonyms for "is nuts about" can come in handy when expressing either positive or negative sentiments towards a particular subject.