“使人痛苦的人”可以翻译为 "a person who causes pain (to others)" 或更简洁地表达为 "a tormentor"（强调持续施加痛苦或折磨的人） 。
具体选择哪种表达可根据语境：
若强调“导致痛苦的行为”，用 "a person who causes pain" 更通用。
若突出“折磨者”的意象（如精神或情感上的长期伤害），"tormentor" 更贴切。
例句：He became a tormentor to his family after losing his job. （失业后，他成了家人的折磨者。）
She felt betrayed by those who had once been her friends but turned into people causing her pain. （她被那些曾是朋友却让她痛苦的人背叛了。）