tormentor

This term carries a heavy emotional weight, evoking images of prolonged cruelty and a power imbalance between the aggressor and the victim. It is more intense than "bully" or "oppressor," as it suggests a deliberate, focused intent to inflict agony, often in a captive or inescapable setting.

While it frequently appears in historical or literary accounts of torture and persecution, it is also used in psychological contexts to describe someone who causes persistent mental anguish. The word emphasizes the active role of the perpetrator in creating a state of misery.