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Adjective: perspicacious  `purspu'keyshus
  1. Acutely insightful and wise
    "much too perspicacious to be taken in by such a spurious argument"
    - sagacious, sapient
     
  2. Mentally acute or penetratingly discerning
    "much too perspicacious to be taken in by so spurious an argument"
    - clear-eyed, clear-sighted

See also: discerning, perspicaciousness, wise