Zestless is an adjective that describes something without energy or enthusiasm. Some of the antonyms for the word zestless are lively, energetic, spirited, and enthusiastic. These words convey a sense of eagerness and excitement, which is the opposite of zestless. Other antonyms for this word include vivacious, animated, dynamic, and exhilarating. These adjectives are often used to describe individuals or situations that are highly stimulating and engaging. Adding any of these antonyms to your vocabulary will help you add more descriptive power to your writing, conversation, or even your personality.