Showing stupidity is an antonym for the word "showing intelligence." Other antonyms include being ignorant, dull-witted, foolish, clueless, slow-witted, and dim-witted. These words refer to a lack of understanding, knowledge, and ability to think critically. They are the opposite of being intelligent, which involves being able to comprehend complex ideas, solve problems, and make rational decisions. Being unintelligent can lead to poor judgment, bad decisions, and a lack of success in various areas of life, such as academics, career, and personal relationships. Therefore, it is important to develop one's intelligence by learning new skills, reading, and engaging in critical thinking exercises.