"Polypersonal" if not "polyontological".
Also, by this standard, Hinduism is not polytheistic.
http://hinduwebsite.com/hinduism/h_polytheism.htm
According to the tenets of Hinduism, God is one as well as many...
Therefore for a Hindu the worship of gods and goddesses is not a mere superstitious idolatry but an act of faith and a form of communication, a way of placing our cares and concerns in the hands of God, the One Supreme Universal Self, of infinite dimensions, who envelops the worlds, the planets and the whole universe and is also hidden in them. The gods and goddesses are His different forms, the many hands, feet and faces of the one Supreme Purusha, the universal Self