Vacantly/ˈveɪkəntli/ Definition 1 of 2Pro Tip 1/3Emotional Disconnection Suggests a person's detachment or lack of response to their environment. Despite the laughter around him, he looked vacantly across the room. Pro Tip 2/3Absence of Thought Implies the mind is unoccupied by thoughts, often appearing inattentive. She answered the question vacantly, clearly distracted by something else. Pro Tip 3/3Social Interaction Can indicate a lack of interest or boredom in social scenarios. He greeted us vacantly, his mind obviously elsewhere.