The antonyms for the word "empty-headed" are numerous and varied. Instead of describing someone as empty-headed, we might describe them as intelligent, clever, or wise. Other antonyms might include knowledgeable, sharp, insightful, or discerning. In terms of personality traits, we might use antonyms such as thoughtful, introspective, contemplative, or flexible. All of these words describe individuals who are the opposite of empty-headed, and who possess a range of positive qualities and characteristics that enable them to succeed in any situation. So, when seeking to describe someone who is anything but empty-headed, consider these and other antonyms that highlight their strengths and benefits.