Any bad, miserable, difficult or terrifying situation or experience that arouses anxiety, terror, agony or great displeasure.
A very bad or frightening dream.
A feeling of extreme anxiety or suffocation experienced during sleep; Sleep paralysis.
To have a nightmare.
Any extreme pain, anguish or misery, either physical or mental.
Torture, originally as inflicted by an instrument of torture.
To cause severe suffering to (stronger than to vex but weaker than to torture.)