Closemouthed (adjective)

Being unwilling to talk or reveal information; secretive.

Origin:

From the word "close" and "mouth", it refers to someone who is unwilling to talk or reveal information.

Examples:

1. He was known for being closemouthed about his personal life.
2. She was closemouthed about the details of her business dealings.
3. He was closemouthed about the reason for his sudden departure.
4. The witness was closemouthed and refused to answer any questions.
5. He was closemouthed about the outcome of the meeting.