In a manner that can be excused or forgiven; understandably and reasonably given the circumstances.
From excusable + -ly (Old English -lice), forming an adverb from the adjective. This allows describing how actions are performed in a way that deserves forgiveness.
When a parent says 'your child excusably spilled the milk,' they're using this word to signal forgiveness is built into the judgment—the circumstances made the mistake understandable, not the person bad.
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