Lean-witted is a term used to describe someone who is not very intelligent or clever. There are several synonyms that can be used to describe this type of person, such as dim-witted, slow-witted, foolish, simple-minded, and unintelligent. These terms are often used to describe individuals who have a lack of critical thinking skills, or who struggle with basic problem-solving tasks. While these words may seem harsh, it is important to remember that intelligence comes in many forms, and individuals who may be considered lean-witted in one area may excel in other areas of their life. Therefore, it's important to use these words with care and consideration.