Not having the power of choosing; destitute of free will.

adjective. without a choice

"6 The term choiceless choice was introduced by the literary scholar Lawrence L. Langer to characterize the moral circumstances of the Nazi death camps: see Versions of Survival: The Holocaust and the Human Spirit Albany: State University of New York Press, 1982, p."

choicelessly  

chess-player  demonly  entities'  head-splitting  heart-pounding