inoperative
adjective
formal uk/ɪˈnɒpərətɪv/ us LAW
if a law or rule is inoperative, it does not have any effect and cannot be used:
Legislation to repeal inoperative provisions in the tax law was approved.
if a machine, system, etc. is inoperative, it does not work as it should and cannot be used:
make/render sth inoperative The virus infects your PC and renders the whole operating system inoperative.