Loggerheaded is a word used to describe someone who is foolish, obstinate, or stupid. Some possible antonyms for this word could include intelligent, reasonable, or adaptable. Other possible antonyms might include open-minded, flexible, or quick-witted. These antonyms would suggest that someone who is not loggerheaded is able to think critically, consider different viewpoints, and adapt to new situations. They are not stuck in their ways and are willing to listen to others. By contrast, someone who is loggerheaded is seen as stubborn, closed-minded, and unwilling to change their ways.