The term "sharp-witted" refers to someone who is quick and intelligent in their thinking and responses. Its antonyms, or opposites, are words that describe the opposite type of behavior or thought process. These antonyms include dull, slow, unintelligent, and unresponsive. If someone is described as being dull-witted, they are seen as lacking intelligence and intellectual abilities. In contrast, if someone is slow-witted, they are seen as taking a long time to process information and come up with a response. Being unresponsive means that someone is indifferent or uninterested in what is happening around them. All of these antonyms reflect a lack of quickness, intelligence or wit.