The antonyms for the word "play clown" can refer to actions or attitudes that are the opposite of being jolly, humorous, or entertaining. Some of the antonyms might include seriousness, solemnity, boredom, and depression. Alternatively, some antonyms might focus on a more rude or aggressive behavior such as bullying, intimidating, or harassing. While clowning brings laughter and joy to people, its antonyms offer a negative outlook on life. However, it is important to recognize that individuals have different personalities, and there is no good or bad in behaving a certain way as long as it is not harmful to others.