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WordNet-Online
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Adjective vigilant has 1 sense
- argus-eyed, open-eyed, vigilant, wakeful, watchful - 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"
Antonym: unalert (indirect, via alert)
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