Open English Wordnet
Adjectives
(s)perspicacious, sagacious, sapientacutely 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”
(s)clear-eyed, clear-sighted, perspicaciousmentally 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”