Antonyms for the phrase "be wild about" would include words such as dislike, hate, detest, and loathe. These words are opposite in meaning to the idea of being enthusiastic or passionate about something. For example, someone who "is wild about chocolate" might have an antonym of "dislike chocolate". Other antonyms could include "be indifferent", "be apathetic", or "be bored with", all of which suggest a lack of interest, excitement, or passion for a particular thing or activity. In essence, antonyms for "be wild about" would convey the opposite sentiment of enthusiasm, excitement, and enjoyment.