confinement

To be kept in strict solitary confinement, and to be closely watched and guarded.

This note was in a different hand from the rest, which showed that it had been added since his confinement.

“A rich Englishman,” continued the abbé, “who had been his companion in misfortune, but had been released from prison during the second restoration, was possessed of a diamond of immense value; this jewel he bestowed on Dantès upon himself quitting the prison, as a mark of his gratitude for the kindness and brotherly care with which Dantès had nursed him in a severe illness he underwent during his confinement.

or solitary confinement.