regrettably

Adverb

In a manner inspiring or deserving regret.

Japanese Meaning

残念ながら / 悔やまれるほどに

Regrettably, the conference was canceled at the last minute due to severe weather.

残念ながら、悪天候のため会議は直前で中止になりました。

Sense（1）

In a manner inspiring or deserving regret.

more regrettably

（ comparative ）

most regrettably

（ superlative ）