The term "more yo-yo" refers to something that is unpredictable or unstable, like the movements of a yo-yo. Alternatively, one could describe such an object or situation using synonyms such as "erratic," "capricious," "volatile," or "inconstant." These words all convey a sense of variability or inconsistency, suggesting that the thing in question is liable to change unpredictably or swing from one extreme to another. Other synonyms for "more yo-yo" may include "unreliable," "unstable," "fickle," or "fluctuating," depending on the context in which the term is used.