Airheadedness refers to the state of being foolish or clueless. Some antonyms for this word could include intelligence, wisdom, astuteness, cleverness, and shrewdness. These words all represent abilities to think critically, make wise decisions, and avoid making foolish mistakes. Someone displaying intelligence would be seen as thoughtful and focused, while someone displaying wisdom would be seen as experienced and knowledgeable. Astuteness and cleverness refer to an ability to think quickly and creatively, while shrewdness would indicate someone who is able to make savvy decisions in their favor. All of these antonyms provide a strong contrast to the notion of airheadedness, representing traits that are highly valued in both personal and professional settings.