a. | 1. | Attentive to discover and avoid danger, or to provide for safety; wakeful; watchful; circumspect; wary. |
Adj. | 1. | vigilant - 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" |