Regrettably
/rɪˈɡrɛtəbli/
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Definition
(adv) In a manner inspiring or deserving regret.
Sentence Examples
Regrettably, we have not received your reply.
Regrettably, this self-centered behavior is absorbed by their children.
CEFR Practice Quiz
____, the event had to be cancelled due to circumstances beyond the organizers' control.