What is an adjective of shy?

Here are some adjectives that could describe someone who is shy:

General:

* Timid

* Bashful

* Modest

* Reserved

* Introverted

* Unsociable

* Withdrawn

* Self-conscious

* Inhibited

* Hesitant

More specific:

* Wallflower

* Awkward

* Nervous

* Uncertain

* Unsure

* Demure

* Meek

* Diffident

The best adjective to use will depend on the specific context and the nuance you want to convey.