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unmitigable

adjective
un·​mitigable | \ "+\

Definition of unmitigable 

: not mitigable stern and unmitigable accusations— Sir Walter Scott

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First Known Use of unmitigable

circa 1616, in the meaning defined above

History and Etymology for unmitigable

un- entry 1 + mitigate + -able

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The first known use of unmitigable was circa 1616

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