Null

As nothing; as if not existing, made, or done; without force or effect; invalid. See Nugatory; Nullus.

Ifiillity

An act which has no more effect than if it had not been done; a proceeding of no legal effect or efficacy. Such a defect as renders the proceeding in which it occurs totally void, of no avail or effect whatever, and incapable of being made so.i

See Void.