extenuating

Extenuating is almost always used today before "circumstances". Extenuating circumstances are an important concept in the law. If you steal to feed your children, you're naturally less guilty than someone who steals just to get richer; if you kill someone in self-defense, that's obviously an extenuating circumstance that makes your act different from murder. Juries will usually consider extenuating circumstances (even when they're instructed not to), and most judges will listen carefully to an argument about extenuating circumstances as well. And they work outside of the courtroom as well; if you miss your daughter's performance in the middle-school pageant, she may forgive you if it was because you had to race Tigger to the vet's emergency room.