1. in an alert manner; with watchful attention or readiness

Examples

• The guard stood alertly at his post throughout the night.
• She listened alertly to every word of the lecture.
• The dog’s ears perked up alertly at the sound of footsteps.
• The students responded alertly to the teacher’s questions.
• He scanned the horizon alertly for any signs of danger.
• The detective observed the suspect alertly during questioning.