Discreet (adjective)

1. Careful not to attract attention; prudent.
2. Careful not to make a noise or disturbance.
3. Careful not to reveal sensitive information.
4. Not obtrusive or conspicuous.

Origin:

Late 16th century: from french discret, from latin discretus "separate, distinct", from the verb discernere (see discern).

Examples:

1. She was discreet in her manner.
2. He was discreet in his approach.
3. The operation was conducted in a discreet manner.
4. The agent was discreet in his investigation.
5. The hotel is discreetly situated.