Astute

astute
    adj 1: marked by practical hardheaded intelligence; "a smart
           businessman"; "an astute tenant always reads the small
           print in a lease"; "he was too shrewd to go along with
           them on a road that could lead only to their overthrow"
           [syn: {astute}, {sharp}, {shrewd}]
    

Astute \As*tute"\, a. [L. astutus, fr. astus craft, cunning;
   perh. cognate with E. acute.]
   Critically discerning; sagacious; shrewd; subtle; crafty.
   [1913 Webster]

   Syn: Keen; eagle-eyed; penetrating; skilled; discriminating;
        cunning; sagacious; subtle; wily; crafty.
        [1913 Webster] {As*tute"ly}, adv. -- {As*tute"ness}, n.
        [1913 Webster]
    

94 Moby Thesaurus words for "astute":
      Machiavellian, Machiavellic, acute, adroit, alert, apperceptive,
      appercipient, arch, argute, artful, cagey, calculating, canny,
      clever, cogent, crafty, cunning, cute, deceitful, deep, deep-laid,
      designing, diplomatic, discerning, discreet, farseeing, farsighted,
      feline, foreseeing, foresighted, forethoughted, forethoughtful,
      foxy, guileful, heady, incisive, ingenious, insidious, insightful,
      intelligent, inventive, judicious, keen, knowing, knowledgeable,
      longheaded, longsighted, observant, pawky, penetrating, perceptive,
      percipient, perspicacious, perspicuous, piercing, politic,
      provident, prudent, quick, quick-witted, ready, resourceful,
      sagacious, sage, savvy, scheming, serpentine, sharp, shifty,
      shrewd, slick, slippery, sly, smooth, snaky, sneaky, sophistical,
      stealthy, strategic, subtile, subtle, supple, tactical, trenchant,
      trickish, tricksy, tricky, underhand, underhanded, understanding,
      vulpine, wary, wily, wise