痛恨 (つうこん, tsuukon) Japanese meaning: deep regret | KotomoraHe lost the match due to a deeply regrettable mistake.
The president expressed deep regret over the accounting fraud.
Usage patterns
痛恨の〈事〉a deeply regrettable ~ (mistake, event, etc.)
He lost the match due to a regrettable mistake.
痛恨の念を抱くto harbor deep regret
She harbors deep regret over that decision.