あろうことか

expression

of all things; can you believe it

An exclamatory phrase expressing shock, disbelief, or indignation at an unexpected or outrageous event. Often used at the beginning of a sentence.

• あろうことか、彼かれは約やく束そくをすっかり忘わすれていた。

  Of all things, he completely forgot about our promise.

• あろうことか、その政せい治じ