Introversion: Introversion is the opposite of outgoingness, referring to a person's tendency to be more reserved, quiet, and inward-focused.
Extraversion: Extraversion is closely related to outgoingness. It describes individuals who are energized by being around others, seeking out social interactions.
Sociability: Sociability is another term associated with outgoingness. It specifically refers to a person's preference for being around people and their ability to interact comfortably in social settings.