1. Having very keen vision (synset 302165853)
    "quick-sighted as a cat"
  2. Carefully observant or attentive;
    On the lookout for possible danger (synset 300092618)
    "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"

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