Argus-eyed Definition
 ärgəs-īd 
    adjective
  
 Extremely observant; vigilant.
 American Heritage 
Keenly observant; vigilant.
 Webster's New World 
Ever vigilant.
Wiktionary 
Synonyms: 
  - sharp-sighted
 - sharp-eyed
 - quick-sighted
 - keen-sighted
 - hawk-eyed
 - lynx-eyed
 - wakeful
 - vigilant
 - open-eyed
 
Origin of Argus-eyed
-  
From the Ancient Greek mythological figure Argus.
From Wiktionary
 
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