Formal Non-feasibility

Vocabulary

やるu-verbto do
事情(じじょう)じ・じょうcircumstances
(みと)めるみと・めるru-verbto acknowledge
()い・くu-verbto go
()い・うu-verbto say
決定(けってい)けっ・ていdecision
延期(えんき)えん・きpostponement
説明(せつめい)せつ・めいexplanation
状況(じょうきょう)じょう・きょうsituation

Advanced ways to say “Cannot” or “Must”.

ざるを()ない (Have no choice but to)

“It is not possible to not do…” → “I have to do it.”

Structure: Negative stem (drop ない) + ざるを()ない

やらざるを()ない。I have no choice but to do it.
(みと)めざるを()ない。I have no choice but to acknowledge it.
()かざるを()ない状況(じょうきょう)だ。It's a situation where I have no choice but to go.

Exception: する → せざるを()ない

説明(せつめい)せざるを()ない。I have no choice but to explain.

やむを()ない (Unavoidable)

“It is unavoidable” / “It can’t be helped”

やむを()ない事情(じじょう)で...Due to unavoidable circumstances...
やむを()ない決定(けってい)だった。It was an unavoidable decision.
延期(えんき)はやむを()ない。The postponement is unavoidable.

Polite form

やむを()ません。It can't be helped. (polite)