Softheaded is a term used to describe someone who lacks intelligence or common sense. Antonyms for this word would include astute, intelligent, shrewd, and savvy. An astute individual is someone who is sharp-witted and quick-minded. On the other hand, an intelligent person possesses a high level of knowledge, expertise, and reasoning ability. Shrewd individuals are known for their practical and sharp insights, while savvy people have a good understanding of the workings of the world. These words offer a contrast to "softheaded," which focuses on the lack of intellect and critical thinking, and instead highlight the opposite qualities of wisdom and cleverness.