服ふく役えき囚しゅう

noun

convict; prisoner serving a sentence

Refers specifically to a person currently serving a prison sentence, not just any detainee.

• その服ふく役えき囚しゅうは模も範はん的てきな態たい度どで刑けい期きを短たん縮しゅくされた。

  The convict had his sentence reduced for exemplary behavior.