torment

Short definition from Wiktionary

Noun

1. 1
   A catapult or other kind of war-engine.
2. 2
   Torture, originally as inflicted by an instrument of torture.
3. 3
   Any extreme pain, anguish or misery, either physical or mental.

Verb

1. 1
   To cause severe suffering to (stronger than to vex but weaker than to torture.)