Source : Webster's Revised Unabridged Dictionary (1913)

Insubordinate \In`sub*or"di*nate\, a.
   Not submitting to authority; disobedient; rebellious;
   mutinous.

Source : WordNet®

insubordinate
     adj 1: not submissive to authority; "a history of insubordinate
            behavior"; "insubordinate boys" [ant: {subordinate}]
     2: disposed to or engaged in defiance of established authority
        [syn: {resistant}, {resistive}]