1. in a watchful and alert manner; with careful attention to potential danger or problems

Examples

• The security guard watched the entrance vigilantly throughout the night.
• Parents must vigilantly monitor their children’s online activities.
• The nurse vigilantly checked the patient’s vital signs every hour.
• Border patrol agents vigilantly scan for suspicious activity.
• She vigilantly protected her personal information from identity thieves.
• The lifeguard vigilantly observed the swimmers in the pool.
• Investors should vigilantly review their portfolios during market volatility.