The word "zestless" denotes a lack of enthusiasm, energy, or flavor. So, what could be its antonyms, that is, words with opposite meanings? We can think of several options. For instance, the word "lively" describes something full of energy, spirit, and excitement. "Flavorful" indicates something rich, tasty, and satisfying to the palate. "Enticing" suggests a quality that attracts attention or interest. "Ebullient" means full of vitality, enthusiasm, and joy. "Stimulating" refers to something that arouses or excites the senses or the mind. In short, there are plenty of antonyms for the word "most zestless" that convey the opposite qualities of vitality, pleasure, or engagement.