regretfully

1. In a regretful manner, with regret.

   with regret (used in polite formulas)

2. (proscribed)Unfortunately, in a manner inspiring or deserving regret; used only as a sentence adverb (to introduce and modify an entire sentence).

1. I regretfully admit that I don't love you anymore.

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2. I can't make you see your own shortcomings, regretfully so.

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3. Members of the jury, regretfully I must declare this proceeding a mistrial.

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4. We regretfully reject your offer.

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5. I was invited last week as well, but it was late so I regretfully turned them down.

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regular