Consider for a moment the concept of Absolute Nothingness.
Nada! No matter nor energy of any kind (neither the familiar forms already known to science nor the possible exotic forms such as dark energy or dark matter).
Nada! No space, no time, and thus no Einsteinian space/time.
Nada! No entities or forces of any kind whatsoever, neither physical nor metaphysical nor spiritual.
Nada! To repeat for emphasis, no entities or forces, no energy or matter of any kind, and nothing as yet undiscovered or recognized or believed in or postulated by scientists, philosophers, sages and pseudo-sages of any ilk.