Anencephalous refers to a condition where a fetus or newborn has an underdeveloped or missing brain. The term antonym means the opposite of a word. In this case, the antonyms of anencephalous could be words like intelligent, thoughtful, wise, perceptive, discerning, and astute. These words describe individuals who possess robust cognitive capabilities and have an active and functional brain. Anencephalous is a medical condition that affects infants, and it describes a lack of brain development. However, when we look for antonyms for this word, we find words that describe the opposite - intelligence, wisdom, and discernment - values that are appreciated by society.