Ever heard of the word Jekyll and Hyde? The fascinating thing is that it exists!
The word is pronounced /ʤekl ∂n haid/.
Jekyll and Hyde is a noun. It is used to refer to a person who is sometimes very pleasant (Jekyll) and sometimes very unpleasant (Hyde) or who leads two very separate lives.
This unusual word has an origin. It found its way into the dictionary from the story by Robert Louis Stevenson, The Strange Case of Dr Jekyll and Mr Hyde, in which Dr Jekyll takes a drug which separates the good and bad sides of his personality into two characters. All the negative characters go to Mr Hyde.
Here is how the word is used in a sentence;
Jack is a difficult person to live with because of his Jekyll and Hyde attitude.