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Adjective: argus-eyed
  1. Having very keen vision
    "argus-eyed as a cat";
    - hawk-eyed, keen-sighted, lynx-eyed, quick-sighted, sharp-eyed, sharp-sighted
  2. Carefully observant or attentive; on the lookout for possible danger
    "a policy of argus-eyed awareness";
    - open-eyed, vigilant, wakeful, watchful

See also: alert, sighted, watchful