Lunkheads are individuals that lack intelligence or are incredibly foolish. Therefore, antonyms for lunkheads would be words that describe individuals that are intelligent, astute, shrewd, or sharp-witted. Some of the antonyms for lunkheads may include clever, wise, sagacious, insightful, prudent, or cunning. These words are used to describe people who have a good level of knowledge, judgment or reasoning ability. People with intellectual curiosity, critical thinking skills, or a strong sense of common sense are examples of those who are antonyms of lunkheads. Ultimately, antonyms of lunkheads represent individuals who use their good judgment and intelligence in making decisions, solving problems, or conducting their daily affairs.