unchangeable - not to be thought of in terms of human personality which can change.
example: man walking with wind blowing at his back. man turns around and wind blows at his front.
Biblical example: Jonah warned town of Nineveh that it would be destroyed. The town repented and turned from rebellion. God spared the town. (God's wrath and God's mercy are constant. All Nineveh did was come under God's mercy.)
source: Little, Paul E. "Know what you believe". Victor Books. Wheaton, Illinois. 1979