The opposite of "having smarts" is "being dim-witted" or "having limited intelligence". These antonyms suggest a lack of cognitive ability or intellectual capacity. An individual who is considered dim-witted may struggle with problem-solving, critical thinking, and remembering information. They may also have difficulty with basic literacy and numeracy skills. On the other hand, people with limited intelligence may require additional support and guidance to navigate daily life. In contrast, those with "having smarts" demonstrate high levels of intelligence, wisdom, and analytical skills. These characteristics manifest themselves in a variety of intellectual pursuits, including language, mathematics, and scientific exploration.