null and void

That which cannot be legally enforced, as with a Contract provision that is not in conformance with the law.

That which cannot be legally enforced, as with a Contract provision that is not in conformance with the law.
Example: Ivenson sells a property and places in the Deed a Covenant that the property may never be sold to someone of a minority race. Since this provision is in defiance of the U.S. Constitution, it could never be enforced and is thereby null and void.

Canceled, invalid, as in The lease is now null and void. This phrase is actually redundant, since null means "void," that is, "ineffective." It was first recorded in 1669.