argus-eyed
1. [ adjective ] having very keen vision
Synonyms: keen-sighted lynx-eyed quick-sighted sharp-eyed sharp-sighted hawk-eyed
Examples:

"quick-sighted as a cat"

Related terms: sighted
2. [ adjective ] carefully observant or attentive; on the lookout for possible danger
Synonyms: wakeful watchful vigilant open-eyed
Examples:

"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"

Related terms: alert
3. [ adjective ] carefully observant or attentive; on the lookout for possible danger
Synonyms: wakeful watchful vigilant open-eyed
Examples:

"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"

Related terms: alert