perspicacious

"much too perspicacious to be taken in by such a spurious argument"; "observant and thoughtful, he was given to asking sagacious questions"; "a source of valuable insights and sapient advice to educators";

"too clear-eyed not to see what problems would follow"; "chaos could be prevented only by clear-sighted leadership"; "much too perspicacious to be taken in by so spurious an argument";