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Adjective: wide-eyed  'wId,Id
  1. (used of eyes) fully open or extended
    "The child watched wide-eyed as the magician performed";
    - wide
     
  2. Exhibiting childlike simplicity and credulity
    "wide-eyed trust";
    - childlike, round-eyed, dewy-eyed, simple

See also: naif, naïf, naive, naïve, open, opened