Related Clues:

• Solitude seeker
• No social butterfly
• Independent sort
• Cave dweller, e.g.
• Antisocial type
• Anchorite
• Hardly the gregarious type
• Hermit, for one
• One keeping one's own company
• Homebody
• No-show at a mixer
• Company dodger
• Reclusive type
• Taker of a religious vow
• Company avoider