There are several antonyms for the term "peachy keen," which means everything is great, pleasant, or satisfactory. These antonyms vary from words that express disapproval or dissatisfaction. For instance, "awful," "terrible," "horrible," "unpleasant," or "unacceptable" could serve as antonyms for peachy keen. Other words that could indicate the opposite of peachy keen include "distasteful," "displeasing," or "unsatisfactory." Some possible expressions that could indicate antonyms of "peachy keen" include "not good at all," "far from satisfactory," or "very displeasing." Overall, understanding antonyms for the term "peachy keen" can help improve communication and better convey feelings and emotions.