しょうがない。

Shōganai.

It can’t be helped.

Word for word

“There is no way (to do it).”

Politeness: Casual

Plain form. Fine with family, close friends and people younger than you. Rude to a stranger or a boss.

When you would say it

Accepting something you cannot change.

Worth knowing

More formal: 仕方がない. Said calmly, not angrily.