Shy

1. Easily frightened; timid.
2. Reserved; disinclined to familiar approach. Antonyms: audacious, bold, brazen, gregarious, extroverted, outgoing
3. Cautious; wary; suspicious.
4. (informal) Short, insufficient or less than.
5. Embarrassed.

Usage notes

• Often used in combination with a noun to produce an adjective or adjectival phrase.
• Adjectives are usually applicable to animals (leash-shy "shy of leashes" or head shy "shy of contact around the head" (of horses)) or to children.