RECALCITRANT

adjective Etymology: Late Latin ~-, recalcitrans, present participle of recalcitrare to be stubbornly disobedient, from Latin, to kick back, from re- + calcitrare to kick, from calc-, calx heel Date: 1843 obstinately defiant of authority or restraint, 2. difficult to manage or operate, not responsive to treatment, resistant , see: unruly ~ noun