SAPIENT
Having or showing great wisdom, sound judgment!
IGNORAMUS
Simpletons fools, dunces know-nothings
Somewhere in time a joker used that appellation for whatever quixotic reason. Sadly some believe they are that and more. WISE. WISDOMLY. SOUND of MIND. CLARITY OF VISION/JUDGMENT. Showing they are indeed SAPS not sapient.
SAP
FOOL, DUPE
Of course there is tree sap and other meanings. Enervate. weaken, undermine, destroy.