nail-biterˈnail-ˌbiter noun [countable] informal 
a very exciting story, film etc
a very exciting story, film etc- impenetrability
- impenetrable
- impenetrably
- imperative
- imperatively
- imperceptibility
- imperceptible
- imperceptibly
- imperfect
- imperfection
- imperfectly
- imperial
- Imperial College
- imperialism
- imperialist
- Imperial War Museum
- imperil
- imperious
- imperiously
- imperiousness
- imperishable
- impermanence
- impermanent
- impermeable
- impermissible