Ungrund: German term meaning groundless; introduced by the German mystic Jakob Boehme (1575–1624) to refer to the Abyss, which is also God, that lies behind the world as its source and explanation, or the undifferentiated Absolute that is ineffable; sometimes defined as pure potentiality.
Grund: German for ground, foundation, basis, reason.
Ungrund and Grund are used to describe the unformed and the formed.
Ungrund is also used to describe the uncreated, or the created which is not yet manifest in form.
Pearls of Wisdom, vol. 31, no. 5, January 31, 1988.