Unconstitutional :  adj : not consistent with or according to a constitution; contrary to the U.S. Constitution [ant: constitutional]

actionable, against the law, anarchic, anarchistic, anomic, black-market, bootleg, chargeable, contraband, contrary to law, criminal, felonious, flawed, illegal, illegitimate, illicit, impermissible, irregular, justiciable, lawless, nonconstitutional, nonlegal, nonlicit, outlaw, outlawed, punishable, triable, unallowed, unauthorized, under-the-counter, under-the-table, unlawful, unofficial, unstatutory, unwarrantable, unwarranted, wrongful,