1. (

• argus-eyed ,
• hawk-eyed ,
• keen-sighted ,
• lynx-eyed ,
• quick-sighted ,
• sharp-eyed ,
• sharp-sighted

) having very keen vision; "quick-sighted as a cat" ;

2. (

• argus-eyed ,
• open-eyed ,
• vigilant ,
• wakeful

) 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" ;