To put excessive burdens upon (someone); to subject (someone) to anxieties.
To persistently bother (someone, or a group of people) physically or psychologically when such behaviour is illegal and/or unwanted, especially over an extended period.
To annoy (someone) frequently or systematically; to pester.
To trouble (someone, or a group of people) through repeated military-style attacks.
To cause severe suffering to (stronger than to vex but weaker than to torture.)
Any extreme pain, anguish or misery, either physical or mental.
Torture, originally as inflicted by an instrument of torture.