1) Absence 2) Air 3) Blankness 4) Inexistence 5) Jazz 6) Nada 7) Naught 8) Nonexistence 9) Nullity 10) Oblivion 11) Unimportance 12) Unsubstantiality 13) Void 1) Lack of being 2) Nonentity 3) Nonexistence 4) Nullity 5) The state of being nothing 6) The state of nonexistence 7) Void 
• (n.) The state of being of no value; a thing of no value. • (n.) Nihility; nonexistence. • (n.) The state of being of no value; a thing of no value. • (n.) Nihility; nonexistence.
(from the article `Existentialism`) ...the modality proper to existence, which is possibility, and the modality proper to Being, which is reality or facticity. As a result of this ... [3 related articles]
Nonbeing. The concept is much used in existentialism, as in the title of Jean-Paul Sartre's work L'Etre et le néant/Being and Nothingness 1943. In logic, it is an error to assume that every...
Noth'ing·ness noun 1. Nihility; nonexistence. 2. The state of being of no value; a thing of no value. 
[n] - the state of nonexistence
void noun the state of nonexistence
the state of being nothing. · something that is nonexistent: a view of humanity as suspended between infinity and nothingness. · lack of being; nonexistence: The sound faded into nothingness. · unconsciousness or death: She remembered a dizzy feeling, then nothingness. · utter insignificance, emptiness, or worthlessness; trivial...