superobstinate

• a word derived from obstinate.
  obstinate

  adjective

  firmly or stubbornly adhering to one's purpose, opinion, etc.; not yielding to argument, persuasion, or entreaty.

Related Words

• adamant
• dogmatic
• headstrong
• inflexible
• intransigent
• recalcitrant
• steadfast
• tenacious
• unyielding
• willful