obstinate and unruly;stubborn (/wild) and intractable ? 監(jiān)獄里選定這個人，認為他是個～的人物，……(楊植霖《王若飛在獄中》71) The prison officials picked him up for his in tractable and untamed nature.
桀驁不馴jie ao bu xun
stubborn and intractable
桀驁不馴jié ào bù xùn
桀驁：性情倔強、暴烈；馴：馴服。形容脾氣暴烈、很難馴服。stubborn and intractable, obstinate and unruly, arrogant and unyielding