The term un-energetic refers to someone who lacks enthusiasm or energy. There are various antonyms for un-energetic, including energetic, dynamic, active, lively, enthusiastic, passionate, and zealous. Someone who is energetic is full of life and vigor, while a dynamic individual has a unique ability to adapt and change to different situations. On the other hand, an active person is always on the move and completing various tasks. Someone who is lively is characterized by a sense of vivaciousness, while an enthusiastic person is highly motivated and passionate about whatever they do. Finally, a zealous individual is genuinely committed to their beliefs or ideas and possesses tremendous energy towards achieving their goals.