Obstinate

1. adjective

   tenaciously unwilling or marked by tenacious unwillingness to yield

   Similar: stubborn, unregenerate

2. adjective

   stubbornly persistent in wrongdoing

   Similar: cussed, obdurate, unrepentant

3. adjective

   resistant to guidance or discipline

   “Mary Mary quite contrary”

   Similar: contrary, perverse, wayward

4. verb

   persist stubbornly

   “he obstinates himself against all rational arguments”