Any person who attempts to define a being who is everywhere, yet invisible, and all-knowing, yet not fully comprehensible by us is entering into a backward exercise.
God wants us to know Him intimately. Jesus said that whoever rejects Jesus (as the Son of God, as Jesus claimed) does not really know Jesus, and has never known God either. But, who does recognize that Jesus is the Son of God, and died for our redemption from the punishment for sin, does know Jesus, and also knows God.
There is only one God, and there will never be another.
It is not possible to define God. But, a person can KNOW God. That is what He wants.