stubborn as a mule

Stubborn as a mule is another way to say you are very stubborn. Mules tend to be extremely stubborn animals and are the hardest to train as well as one of the most difficult animals to move when they dont want to. This phrase is commonly used about a person who is very stubborn in that they wont bend their own rules or change their own opinions about things; it may be used in a sarcastic tone or a negative way.