unenforceable
adjective
uk/ˌʌnɪnˈfɔːsəbl̩/ us/-ˈfɔːr-/ LAW
an unenforceable law or system cannot be accepted as legal in a court of law:
Sections of the amendment are unenforceable under federal law.
that people cannot be made to obey, or that cannot be made to work effectively:
The proposed reforms are so complex that they will be virtually unenforceable in practice.