Franz had so managed his route, that during the ride to the Colosseum they passed not a single ancient ruin, so that no preliminary impression interfered to mitigate the colossal proportions of the gigantic building they came to admire.
He dressed entirely in black, with the exception of his white tie, and his funeral appearance was only mitigated by the slight line of red ribbon which passed almost imperceptibly through his button-hole, and appeared like a streak of blood traced with a delicate brush.
"If the Supreme Being has directed the fatal blow," said Emmanuel, "it must be that he in his great goodness has perceived nothing in the past lives of these people to merit mitigation of their awful punishment."
There are no more uses of "mitigate" in the book.
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Don’t judge her so harshly until you consider the mitigating circumstances.
The new factory is building privacy walls to mitigate its impact on neighbors.