Source : Webster's Revised Unabridged Dictionary (1913)

Ungovernable \Un*gov"ern*a*ble\, a.
   Not governable; not capable of being governed, ruled, or
   restrained; licentious; wild; unbridled; as, ungovernable
   passions. -- {Un*gov"ern*a*bly}, adv. --Goldsmith.

Source : WordNet®

ungovernable
     adj : of persons; "the little boy's parents think he is spirited,
           but his teacher finds him unruly" [syn: {indocile}, {uncontrollable},
            {unruly}]