Dim-wittedness refers to the lack of intelligence or mental capacity. The antonyms for this word would be proficiency, cleverness, intelligence, sharpness, brilliance, and astuteness. Proficiency refers to the skillfulness, expertise, and competence of a person. Cleverness implies the ability to think quickly and find creative solutions to problems. Intelligence refers to the overall mental capacity of a person to understand, learn, and solve complex things. Sharpness indicates the quickness and accuracy of a response. Brilliance refers to mental brightness, creativity, and originality. Astuteness implies quickness, sharpness of mind, and shrewdness. Therefore, the antonyms of dim-wittedness provide a clear distinction between the lack of intelligence and the presence of intellectual qualities.