Unsmart is a term that is often used to describe someone who lacks intelligence or common sense. However, there are several synonyms for unsmart that can be used in order to describe someone who is not clever or intelligent. Some synonyms for unsmart include dim-witted, foolish, idiotic, unintelligent, unwise, daft, dense, moronic, and clueless. Each of these words shares a similar meaning to unsmart and is often used when describing someone who lacks mental acuity. These synonyms can also be used to describe behaviors or decisions that are not well thought out or lack a certain level of intelligence.