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regrettably /rɪˈgrɛtəbli/  

  • adverb
    [more ~; most ~]
    used to say that something is disappointing or regrettable
    Regrettably [=unfortunately], I cannot go.
    Regrettably, the movie theater was shut down.
    to an extent that causes disappointment or regret
    There has been a regrettably [=disappointinglylarge decline in wages.
    The progress of the work was regrettably slow.