reticent

adjective2

1. •
   Unwilling to communicate; keeping one's thoughts and opinions to oneself; reserved or restrained.

   • She's rather reticent on the subject of her finances.
2. •
   (nonstandard) Hesitant or not wanting to take some action; reluctant (usually followed by a verb in the infinitive).

   • He is reticent to travel so much.