hypervigilant

/ˌhaɪpərˈvɪdʒələnt/
adjective
  1. Extremely alert and watchful, especially for potential threats or danger.
    • People with anxiety disorders often feel hypervigilant in crowded places.
    • The security guard remained hypervigilant throughout his shift, scanning every corner of the building.
    • After the burglary, the family became hypervigilant about locking all doors and windows.