pertinacious

/ˌpər-tə-ˈnā-shəs/

Latin pertinac-, pertinax, from per- thoroughly + tenac-, tenax tenacious, from tenēre

adjective

  1. adhering resolutely to an opinion, purpose, or design

  2. perversely persistent

  3. stubbornly tenacious

obstinate dogged stubborn pertinacious mulish mean fixed and unyielding in course or purpose. obstinate implies usually an unreasonable persistence. dogged suggests an admirable often tenacious and unwavering persistence.