Often used in legal situations to describe factors that may reduce a sentence. His attorney argued that there were extenuating factors justifying his actions.
Pro Tip 2/3
Not Excuses
'Extenuating' doesn't mean an excuse, it suggests reasons that make the issue less severe. She cited her illness as an extenuating circumstance for missing the deadline.
Pro Tip 3/3
Seriousness Reduction
Use it when you want to express that something serious has been made to seem less so. Despite the extenuating factors, the committee still decided to impose a penalty.