recalcitrant \rih-KAL-sih-truhnt\ (adjective) - Stubbornly resistant to and defiant of authority or restraint.
"The driver, recognizing Emerson, managed to stop the recalcitrant animal before it ran into my equally recalcitrant spouse." -- Elizabeth Peters, 'The Golden One'
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Recalcitrant derives from Latin recalcitrare, "to kick back," from re-, "back" + calcitrare, "to strike with the heel, to kick," from calx, calc-, "the heel."