Related Clues:

• Not at all brave
• Hardly courageous
• Reluctant to mingle
• Wary of people
• Spotlight-avoiding
• Reluctant to commit
• Socially self-conscious
• Averse to conversing
• Short, in a way
• Lacking backbone
• Far from aggressive
• Hardly forward
• Inclined to avoid the spotlight
• Waffling
• Clark Kent-like