Synonyms of vigilant
- 1. argus-eyed, open-eyed, vigilant, wakeful, alert (vs. unalert), watchful
- usage: carefully observant or attentive; on the lookout for possible danger; "a policy of open-eyed awareness"; "the vigilant eye of the town watch"; "there was a watchful dignity in the room"; "a watchful parent with a toddler in tow"
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Definition and meaning of vigilant (Dictionary)