null and void
No longer valid, legitimate, or enforceable. This contract shall be rendered null and void immediately should either party fail to fulfil their obligations.
null and void
Cliché without legal force; having no legal effect. The court declared the law to be null and void. The millionaire's will was null and void because it was unsigned.
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.
ˌnull and ˈvoid
(formal) (of a legal agreement) no longer effective or valid: The contract was declared null and void.