まさか (masaka): Surely not or never expected

Surely not; never expected; it cannot be that

まさか + clause + とは思わなかった, ないだろう, or はずがない. It can also stand alone: まさか！

Express disbelief, surprise, or the view that something is very unlikely. It can also stand alone as an exclamation. Masaka does not by itself create an absolute negative; the ending and context establish the intended meaning.

まさかこんな所で会うとは思いませんでした。

I never expected to meet you in a place like this.

まさか鍵を会社に忘れたのではないでしょうね。

Surely you did not leave the key at the office?

彼が約束を忘れるなんて、まさかと思いました。

I found it hard to believe that he had forgotten our appointment.

まさか自分が優勝するとは思っていませんでした。

I never imagined that I would win first place.

まさか一日で全部終わるとは驚きです。

It is surprising that everything was finished in just one day.