Such a lady gave a neighborliness to both rank and religion, and mitigated the bitterness of uncommuted tithe.
Will wished that she would speak and bring some mitigating shadow across his own cruel speech, which seemed to stand staring at them both in mockery of any attempt at revived fellowship.
His marriage seemed an unmitigated calamity; and he was afraid of going to Rosamond before he had vented himself in this solitary rage, lest the mere sight of her should exasperate him and make him behave unwarrantably.
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.