horror

Concise Oxford English Dictionary © 2008 Oxford University Press:
horror/ˈhɒrə(r)/

▶noun

• 1 intense fear, shock, or disgust.

  ■ a cause of horror.

  ■ (the horrors) an attack of extreme anxiety: the mere thought of it gives me the horrors.

  ■ great dismay.

• 2 informal a bad or mischievous person, especially a child.

– origin ME: via OFr. from L. horror, from horrere (see horrid).