Vigilant — synonyms, definition

1. vigilant (a)

alert astir attentive awake aware circumspect eager eagle-eyed heedful intent jealous keen mindful observant on the ball open-eyed perceptive rapt sharp sharp-sighted • • •

2. vigilant (Adjective)

argus-eyed

vigilant (Adjective) — Carefully observant or attentive; on the lookout for possible danger. ex. "the vigilant eye of the town watch"