regrettably /rɪˈgrɛtəbli/ adverb Learner's definition of REGRETTABLY
[more regrettably; most regrettably]
1
—
used to say that something is disappointing or regrettable遗憾的是；令人惋惜的是 -
Regrettably [=unfortunately], I cannot go.遗憾的是，我不能去。
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Regrettably, the movie theater was shut down.遗憾的是，电影院关门了。
2
: to an extent that causes disappointment or regret（某种程度上）令人遗憾地，令人惋惜地