1. (

• perspicacious ,
• sagacious ,
• sapient

) 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. (

• clear-eyed ,
• clear-sighted ,
• perspicacious

) 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" ;