discreet
Definitions
Careful and circumspect in one's speech or actions, especially in order to avoid causing offense or to gain an advantage.
Intentionally unobtrusive or modest in appearance or character.
Examples
She made a discreet inquiry to find out if the position was still available.
The hotel staff was very discreet about the identity of their high-profile guests.
Synonyms
cautious prudent tactful circumspect diplomatic reserved guarded