Syria

"Becoming imprisoned" is the acclimation to prison and imprisonment. The term "the one who is imprisoned" is derived from it, meaning the person who feels "becoming imprisoned." The verb "to become imprisoned" is also derived from it.

General terminology.

When a prisoner settles into the prison, relaxes into the environment, treats it as his home, and time is no longer a consideration.
Source: Yassin Al-Haj Saleh, Salvation O' Youth, Dar Al-Saqi, Beirut, 2012, p. 96.

The strongest is the one who becomes imprisoned within his prison, he has accepted his fate whether it be life or death, or perhaps he limits his thoughts to somewhere in the middle––between the pulse of life and the sigh of departure.
Source: Ali Abu Dehn, Return from Hell: Memories of Tadmor and its Sisters, Dar Al-Jadeed, Beirut, 2012, p. 88.

Someone who seems to have been born in prison. He doesn't live in constant hope of his release.
Source: Yassin Al-Haj Saleh, Salvation O' Youth, Dar Al-Saqi, Beirut, 2012, p. 148.

I started to become imprisoned, meaning I started to not care about the difference between things.
Source: Loay Hussein, Loss, Dar Al-Furat, Beirut, 2006, p. 70.