recalcitrant
adj. US //ɹɪˈkæɫsɪtɹənt// UK //ɹɪkˈælsɪtɹənt// re·cal·ci·trant
Borrowed from French récalcitrant, from Latin recalcitrāns, recalcitrantis, present participle of recalcitrō, recalcitrāre (“be disobedient, kick back [as a horse]”), from calx (“heel”), 1820s.