In the afternoon the dark clouds began to overtake them: a sombre canopy with great billowing edges flecked with dazzling light.
Beyond it were slopes covered with sombre trees like dark clouds.
The great smokes had risen and grown thinner, and the last hours of a sombre day were passing; the red glare of Mordor had died away in sullen gloom.
At length they reached the trees, and found that they stood in a great roofless ring, open in the middle to the sombre sky; and the spaces between their immense boles were like the great dark arches of some ruined hall.
There are no more uses of "somber" in the book.
Show samples from other sources
Before she said anything, I knew it was bad news from her somber face.