Source : Webster's Revised Unabridged Dictionary (1913)

Disobey \Dis`o*bey"\, v. t. [imp. & p. p. {Disobeyed}; p. pr. &
   vb. n. {Disobeying}.] [F. d['e]sob['e]ir; pref. d['e]s- (L.
   dis-) + ob['e]ir. See {Obey}, and cf. {Disobedient}.]
   Not to obey; to neglect or refuse to obey (a superior or his
   commands, the laws, etc.); to transgress the commands of (one
   in authority); to violate, as an order; as, refractory
   children disobey their parents; men disobey their Maker and
   the laws.

         Not to disobey her lord's behest.        --Tennyson.

Disobey \Dis`o*bey"\, v. i.
   To refuse or neglect to obey; to violate commands; to be
   disobedient.

         He durst not know how to disobey.        --Sir P.
                                                  Sidney.

Source : WordNet®

disobey
     v : refuse to go along with; refuse to follow; be disobedient;
         "He disobeyed his superviser and was fired" [ant: {obey}]