noth·ing·ness [ nuhth-ing-nis] NOUN 1. the state of being nothing. 2. something that is nonexistent: a view of humanity as suspended between infinity and nothingness. 3. lack of being; nonexistence: The sound faded into nothingness. 4. unconsciousness or death: She remembered a dizzy feeling, then nothingness. 5. utter insignificance, emptiness, or worthlessness; triviality: The days followed one another in an endless procession of nothingness.