adjective: Having keen judgment or wisdom.
From Latin sagire (to perceive keenly). Ultimately from the Indo-European root sag- (to seek out), which is also the source of seek, ransack, ramshackle, forsake, and hegemony. Earliest documented use: 1607.
“Even Warren Buffett is looking less than sagacious after his holding company posted its worst year ever.”
The Long and the Short; The Economist (London, UK); Mar 12, 2009.