Energy-giving is a term used to describe something that provides vitality, strength, and vigor. However, sometimes there may be situations where you want to convey the opposite meaning. In that case, you could use antonyms for the term more energy-giving. Some possible antonyms for the phrase 'more energy-giving' include enervating, exhausting, enfeebling, weakening, and draining. These words describe things or activities that sap one's energy levels, leaving them tired and depleted. Examples could include tedious work, strenuous exercise, or stressful situations. Therefore, it's important to understand the context in which you use these words to ensure you convey the exact message you intend.