Related Clues:

• Not outgoing
• Far from bold
• Like wallflowers
• Sudden start
• Not camera-ready?
• Indebted to the pot, in poker lingo
• Earth's inheritors
• Unlikely to break the ice
• Lacking self-confidence
• Not at all brave
• Hardly courageous
• Reluctant to mingle
• Wary of people
• Lamblike
• Adjective for Clark Kent