The word "flaggy" refers to something that is weak, limp, and lacking energy. There are a number of different synonyms that can be used to describe something that is flaggy, including flaccid, floppy, droopy, limp, wilted, slack, and weak. These words all convey a sense of lethargy and a lack of strength or vitality. Other synonyms for the word "flaggy" might include terms like languid, enervated, debilitated, or weakened, all of which highlight the idea of something that has lost its vigor, vitality, or strength. When used in context, these synonyms can help to convey a more nuanced sense of what it means for something to be flaggy and how it can be described.