► stubborn refusing to change your mind, even when people think you are wrong or are being unreasonable: · Dave can be really stubborn once he’s made up his mind.· a stubborn old man
► obstinate very stubborn, in way that is annoying and unreasonable: · I have never met anyone so obstinate.· his obstinate refusal to compromise
► pig-headed informal refusing to change your mind, even when people think that what you want to do is stupid: · I told her she was making a big mistake but she was too pig-headed to listen.· I wish you’d stop being so pig-headed!
► headstrong very determined to do what you want, often without thinking about the results of your actions – used especially about young people: · As a girl, she had been lively and headstrong.· the headstrong impulsiveness of youth
► wilful British English (also willful American English) doing what you want, even after you have been told to stop, or when you know that it is wrong – used especially about children: · He was a spoiled and wilful child, who always got his own way.· She was passionate and wilful – exactly the sort of creature a man ought to avoid.
► ornery American English behaving in an unreasonable and often angry way, especially by doing the opposite of what people want you to do: · an ornery kid· Teenagers can be ornery and rude.
behaving in an unreasonable and often angry way, especially by doing the opposite of what people want you to do: 
an ornery kid