vigilant

//ˈvɪdʒ.ɪ.lənt//
C1Frequency Level 11Formal
Visual representation of vigilant

Adjective

vigilantCanonical form
more vigilantComparative
most vigilantSuperlative
1

Keeping careful watch for possible danger or difficulties; alert and watchful.

Security guards must remain vigilant at all times.

2

Attentive to detecting and avoiding error, danger, or harm.

Parents must remain vigilant about their children's online activities.