The word "nitwitted" is often used to describe a person who lacks intelligence or common sense. However, there are several synonyms that can be used to convey the same meaning in a more tactful manner. Some of the suitable alternatives to "nitwitted" are "unintelligent," "unwise," "simple-minded," "foolish," "stupid," "uninformed," "ignorant," "naive," and "unperceptive." Each of these words carries their connotation, so it is important to understand the context in which they are being used. By using these synonyms, one can effectively communicate without offending or hurting someone's feelings.