expression
unfortunately; I regret to say; I'm sorry to say
Formal expression used to preface an unfortunate statement or outcome. Often used in business or official contexts.
遺憾ながら、その提案は受け入れられません。
Unfortunately, we cannot accept that proposal.
遺憾ながら、本日のイベントは中止となりました。
I regret to say that today's event has been cancelled.