astute
AdjectiveWordNet 3.0
Webster's Dictionary (GCIDE)
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]