In the apartment, Toohey led him to an armchair and stood before him, somber as a judge.
He was saying to a somber young female who wore glasses and a low-cut evening gown: "My dear, you will never be more than a dilettante of the intellect, unless you submerge yourself in some cause greater than yourself."
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.