hebetude \HEB-uh-tood-; -tyood\, noun:
Mental dullness or sluggishness.
Hebetude derives ultimately from Latin hebes, "blunt, dull, mentally dull, sluggish, stupid." The adjective form is hebetudinous.
From that solitude, full of despair and terror, he was torn out brutally, with kicks and blows, passive, sunk in hebetude.
-- Joseph Conrad, Nostromo