self-willed
From Longman Dictionary of Contemporary Englishself-willedˌself-ˈwilled adjective DETERMINEDvery determined to do what you want, whatever other people think – used to show disapproval SYN obstinate a wild and self-willed child —self-will noun [uncountable]Examples from the Corpusself-willed• Even at that age, Constance seemed perhaps too self-willed and wild, like the countryside she roamed so freely.