hebetude

n.
Dullness of mind; mental lethargy.

[Late Latin hebetūdō, from Latin hebes, hebet-, dull.]

hebetudinous heb'e·tu'di·nous (-tūd'n-əs, -tyūd'-) adj.

(heb-i-TOOD-n-uhs -TYOOD-)

adjective
Dull or lethargic, especially relating to the mind.

Etymology
From Late Latin hebetudo (dullness), from Latin hebes (dull).

Usage
"Examination of precedents led the judge to his conclusion, but he had something to say first: 'It would be hebetudinous and obtuse to fail to be cognizant of the adverse consequences of a ruling in this case." — James J. Kilpatrick; A Clown And a Blowhard on the Bench; Buffalo News; Apr 10, 1993.

"The audience waits in a kind of hebetudinous fixation, perhaps astonished at the perfectly sustained level of mediocrity." — Kevin Kelly; 'Aspects of Love': Unlovable; The Boston Globe; Apr 27, 1990.

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noun

A deficiency in mental and physical alertness and activity: dullness, languidness, languor, lassitude, leadenness, lethargy, listlessness, sluggishness, stupor, torpidity, torpor. See action/inaction.

lethargy, dullness