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• s  having very keen vision
• s  carefully observant or attentive; on the lookout for possible danger

• Yes, my argus-eyed Nicolas, this is the one.
• Washington became full, and still is, of his "boys," who not only get work done the way he wants it but constitute an argus-eyed personal intelligence service.

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

Quotes

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• Harold Evans in Independent
  Evans says in his autobiography that he "wanted to reflect [Victorian editor] WT Stead's 'governing functions of the press' - its 'Argus-eyed power of inspection'."