’His extravagance, Mr Nickleby,’ said Madame Mantalini, addressing herself to Ralph, who leant against his easy-chair with his hands behind him, and regarded the amiable couple with a smile of the supremest and most unmitigated contempt,—’his extravagance is beyond all bounds.’
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.