Abrupt
Part of speech: verb
Definition: To tear off or asunder. To interrupt suddenly.
Part of speech: noun
Definition: Something which is abrupt.
Part of speech: adjective
Definition: Extremely steep or craggy as if broken up; precipitous. Without notice to prepare the mind for the event; sudden; hasty; unceremonious. Curt in manner; rude; uncivil; impolite. Having sudden transitions from one subject or state to another; unconnected. Suddenly terminating, as if cut off; truncate.
Example sentence: Fossil fuels, including oil, are running out and supplies are getting harder to find. If we do nothing, prices will continue to rise and our reliance on oil will come to an abrupt and tumultuous end, causing global economic and social turmoil.
Sudden
Part of speech: adjective
Definition: Happening quickly and with little or no warning.
Part of speech: adverb
Definition: Suddenly.
Example sentence: Puberty hit me pretty hard. All of a sudden, I woke up, and I had really curly hair.