Synonyms of 'mitigating'
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If you say that there are extenuating circumstances for a bad situation or wrong action, you mean that there are reasons or factors which partly excuse it.
There were extenuating circumstances for her crime.
serving as an excuse
Thesaurus for mitigating from the Collins English Thesaurus
Mitigating circumstances or factors make a bad action easier to understand and excuse , and may result in the person responsible being punished less severely.