Webster's English Dictionary

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sagacious

Cross references:
  1. shrewd                
 
sa.ga.cious \s*-'ga--sh*s, sig-'a--\ aj [L sagac-, sagax sagacious; akin to 
   L sagire to perceive keen]ly - more at SEEK obs  1: keen in sense 
   perception  2a: of keen and farsighted penetration and judgment : 
   DISCERNING <(~ judge of character} 2b: caused by or indicating acute 
   discernment {~ purchase of stock } - sa.ga.cious.ly av