An inoperative rule, principle, or tax is one that does not work any more or that cannot be made to work.
Translation English Cobuild Collins Dictionary
broken, broken-down, buggered (slang, chiefly Brit.) defective, hors de combat, ineffective, ineffectual, inefficacious, invalid, nonactive, null and void, on the fritz (U.S. slang) out of action, out of commission, out of order, out of service, unserviceable, unworkable, useless
English Collins Dictionary - English synonyms & Thesaurus
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