nothingness

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The condition or quality of being nothing; nonexistence.
• noun Empty space; a void.
• noun Lack of consequence; insignificance.
• noun Something inconsequential or insignificant.

from The Century Dictionary.

• noun The absence or negation of being; nihility; non-existence.
• noun Insignificance; worthlessness.
• noun A thing of no consequence or value.

from the GNU version of the Collaborative International Dictionary of English.

• noun Nihility; nonexistence.
• noun The state of being of no value; a thing of no value.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun State of nonexistence; the condition of being nothing.
• noun Void; emptiness.
• noun Quality of inconsequentiality; lacking in significance.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the state of nonexistence
• noun empty rhetoric or insincere or exaggerated talk