perspicacious

英 [,pɜːspɪ'keɪʃəs] 美[,pɝspɪ'keʃəs]

1. acutely insightful and wise;: "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"

2. mentally acute or penetratingly discerning;: "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"