The word "yoyoing" refers to the action of playing with a yoyo. When it comes to antonyms, we can consider words that describe the opposite of playing with a yoyo. Some possible antonyms for "yoyoing" include staying still, remaining static, standing motionless, or staying stationary. Other potential antonyms could be focusing on a task, working diligently, being productive, or engaging in a serious activity. Overall, there are many words that might serve as effective antonyms for "yoyoing," depending on the context and the specific meaning that one is trying to convey.