solitary confinement
solitary

He has been held in solitary confinement for most of the time.

A large number were held in solitary confinement for months or years.

Then they took me to a room where I was in solitary confinement.

He was held for nearly 8 months in solitary confinement.

He is being held in solitary confinement for the next 20 years.

He has spent the last 4 of 5 years in solitary confinement.

Much, perhaps all of that time he has been held in solitary confinement.

He has been in solitary confinement for more than five months, they added.

During most of that time, he was in solitary confinement.

For nine of those years he was in solitary confinement.