Bible Dictionary
TORMENTOR
A tormentor may mean a torturer or jailer, especially one holding a debtor until restitution was made. In the parable of the unforgiving servant, the term refers to those who inflicted imprisonment and suffering.
Biblical Usage
Jesus’ parable uses tormentors in the setting of a debtor who was delivered to imprisonment after failing to meet an obligation. The suffering associated with confinement is treated as torment.