This is not dumbness, or denseness, or illiteracy, but belligerent unenlightenment.
At first he was thought an enemy, who in the denseness of the undergrowth had passed our lines on a tour of observation.
Darkness of smoke, denseness of forest growth, treachery of swampy soil!
To penetrate far inland, however, was not so easy, owing to the denseness of the vegetation.
But the denseness of the throng held her fixed even while revolvers flashed.
In a moment, cart, horse, and driver were swallowed up in the denseness of the night.
Such is the enormity of our sin, and the denseness of our ignorance when we shut God out of our business affairs.
Here and there a yellow light struggled to pierce the denseness of the gloom.
His denseness irritated Blinky slightly, with the result that the right side of his face again underwent an alarming convulsion.
Neither Jack nor his wife would understand what he meant—their denseness was impenetrable.
early 15c., from Middle French dense and directly from Latin densus "thick, crowded; cloudy," perhaps from PIE root *dens- "dense, thick" (cf. Greek dasus "hairy, shaggy"). Sense of "stupid" is first recorded 1822.