1) The tenebrousness of the underground cave made it difficult to navigate.

2) As night fell, the tenebrousness of the forest grew more intimidating.

3) The old mansion was shrouded in tenebrousness, giving it an eerie atmosphere.

4) The tenebrousness of the storm clouds signaled an impending thunderstorm.

5) Walking through the deserted streets at night, I felt the tenebrousness of the city envelop me.

6) The tenebrousness of the room added to the mystery of the painting hanging on the wall.

7) The tenebrousness of the haunted house made even the bravest visitors shiver with fear.

8) The tenebrousness of the tunnel made it seem endless and foreboding.

9) The tenebrousness of the forest at dusk created a sense of foreboding.

10) The tenebrousness of the water made it impossible to see what lurked beneath the surface.