The antonyms for the word "more clearheaded" are cloudy, vague, confused, muddled, and hazy. When a person is cloudy, they lack clarity and cannot think straight. Someone who is vague exhibits a lack of clarity, making it difficult to understand what they mean. A person who is confused may be uncertain or bewildered, unable to grasp something. Muddled individuals typically have confused thoughts, unclear ideas, and even memory loss. Hazy people have a lack of clarity in their thoughts, ideas, or surroundings. Thus, using these antonyms can describe people who are not clearheaded, making it harder for them to make decisions or be productive.