'argus-eyed' definitions:

Having very keen vision; "quick-sighted as a cat" [syn: argus-eyed, hawk-eyed, keen-sighted, lynx-eyed, quick-sighted, sharp-eyed, sharp-sighted]

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" [syn: argus-eyed, open-eyed, vigilant, wakeful]