FreeVocabulary
Vigilant
/ˈvɪdʒɪlənt/ adjective easyStaying alert and watchful for possible danger or trouble.
The lifeguard remained vigilant, scanning the water even during the slowest hours of the shift.
Memory Trick
Vigilant comes from 'vigil,' a watch kept through the night -- a vigilant person keeps that same sleepless watch over whatever they are guarding.