"perspicacious" in the adjective sense
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"
Source: WordNet® (An amazing lexical database of English)
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