prison

A place or institution of confinement, especially of long-term confinement for those convicted of serious crimes or otherwise considered undesirable by the government.

"The cold stone walls of the prison had stood for over a century."

Confinement in prison.

"Prison was a harrowing experience for him."

Any restrictive environment, such as a harsh academy or home.

"The academy was a prison for many of its students because of its strict teachers."

To imprison.