unguarded

Adjective Satellite

• lacking protection or a guard
  • "an unguarded gate"
  • "his unguarded queen was open to attack"
• displaying or feeling no wariness
  • "an unguarded remark"

Adj

• Having no guard or protection; vulnerable.
• Displaying a lack of caution or thought.

Examples

• I let out her secret in an unguarded moment.
• The unguarded gatehouse was soon taken by the invading army.