Cutup, which is typically used to describe someone who is a jester or prankster, has several antonyms depending on the context. If one wants to describe someone who is serious and solemn, words like sober, grave, and somber are appropriate antonyms. On the other hand, if one wants to describe someone who is not prone to joking around or conducting pranks, words like sedate, straight-laced, and serious-minded may be used. The antonyms for cutup can also vary based on whether the term is being used to describe someone's behavior, actions, or personality, and it's essential to choose the right words depending on the intended meaning.