1. careful not to reveal one’s thoughts or feelings; cautious in speech or behavior
2. protected by guards or security measures

Examples

• She gave a guarded response when asked about her plans.
• The witness was guarded in his testimony.
• He remained guarded about his personal life during the interview.
• The prison is heavily guarded at all times.
• The museum’s most valuable artifacts are kept in a guarded room.
• After being betrayed, she became more guarded with new friends.
• The celebrity’s home is guarded by security personnel.