reticent

adj

Etymology: Latin reticēns, present participle of reticeō (“to keep silence”).

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.”

   “They are slow and reticent, and are like a dull good horse which lets every nag pass him, but with whip and spur will run down every racer in the field.”

2. Hesitant or not wanting to take some action; reluctant (usually followed by a verb in the infinitive).

   “He is reticent to travel so much.”

   “While many uncomfortable components of the Holocaust have been analyzed in minute detail, the rape of Jewish women during this era persists as a subject that scholars and victims alike are reticent to explore.”