source: [監獄学園の裏生徒会が囚人服を着て懲罰棟に向かうGIF画像｜無料GIF画像検索 GIFMAGAZINE 675004]

a person who has been taken prisoner or an animal that has been confined.

捕虜, 人質, 囚人(prisoner)

imprisoned or confined:

捕虜になった, 捕らえられた

e.g. the farm was used to hold prisoners of war captive

e.g. a captive animal.

attributive having no freedom to choose alternatives or to avoid something:

〖名詞の前で〗選択の自由のない〈消費者など〉

e.g. advertisements at the movie theater reach a captive audience.

(of a facility or service) controlled by, and typically for the sole use of, an establishment or company:

〖名詞の前で〗専属の〈(子)会社など〉

e.g. a captive power plant.

late Middle English: from Latin captivus, from capere ‘seize, take’.