Source : Webster's Revised Unabridged Dictionary (1913)

Recalcitrant \Re*cal"ci*trant\, a. [L. recalcitrans, p. pr. of
   recalcitrare to kick back; pref. re- re- + calcitrare to
   kick, fr. calx heel. Cf. {Inculcate}.]
   Kicking back; recalcitrating; hence, showing repugnance or
   opposition; refractory.

Source : WordNet®

recalcitrant
     adj 1: marked by stubborn resistance to and defiant of authority or
            guidance; "a recalcitrant teenager"; "everything
            revolves around a refractory individual genius" [syn:
            {refractory}]
     2: marked by stubborn resistance to authority; "the University
        suspended the most recalcitrant demonstrators"