extenuating
adjective C2- That attenuates or lessens the seriousness of something, e.g. by providing a mitigating excuse for it.
From the library
Miss Bennet was the only creature who could suppose there might be any extenuating circumstances in the case unknown to the society of Hertfordshire: her mild and steady candour always pleaded for allowances, and urged the possibility of mistakes; but by everybody else Mr.
“There will be extenuating circumstances,” he replied.
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