adj 1: having very keen vision; "quick-sighted as a cat" [syn: hawk-eyed, keen-sighted, lynx-eyed, quick-sighted, sharp-eyed, sharp-sighted]
2: 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: open-eyed, vigilant, wakeful, watchful]