unconstitutional
adjective uk/ʌnˌkɒn.stɪˈtʃuː.ʃən.əl/ us/ʌnˌkɑːn.stɪˈtuː.ʃən.əl/
违背宪法的；违反宪章的
not allowed by the constitution (= set of rules for government) of a country or organization
Changing the law in this way would be unconstitutional. 对该法律作此改动是与宪法相抵触的。
Opposite: constitutional
Compare: nonconstitutional