1. the state of being alert and carefully observant

Examples

• The security guard’s watchfulness prevented the theft.
• Parents must maintain constant watchfulness around young children near water.
• Her watchfulness during the meeting helped her catch the important details.
• The dog’s natural watchfulness made it an excellent guard animal.
• Years of military training had developed his keen watchfulness.
• The teacher’s watchfulness ensured no student cheated on the exam.