Related Clues:

• Hardly the gregarious type
• Confined
• Hermit, for one
• One keeping one's own company
• Homebody
• No-show at a mixer
• Company dodger
• Locked up
• Reclusive type
• Taker of a religious vow
• Crab type
• Company avoider
• Society avoider
• Extrovert's opposite
• Not a people person