argus-eyed

Adjective

• 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
    

• having very keen vision
  • quick-sighted as a cat
    

Related words

• Synonyms: 
  open-eyed , vigilant , wakeful , hawk-eyed , keen-sighted , lynx-eyed , quick-sighted , sharp-eyed , sharp-sighted