Paunchiest, which refers to being excessively fat or having a large belly, can be described as its opposite by using antonyms such as fit, slim, and toned. Other antonyms for paunchiest include slender, thin, lean, and svelte. These words describe physical attributes that are often associated with a healthy and active lifestyle. While paunchiest may carry negative connotations, these antonyms suggest positive traits such as discipline, self-control, and commitment to maintaining a healthy weight. By using these opposing words, we can create a clearer contrast and a more nuanced description of physical appearance.