The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]