Illiberal democracy is a special constitutional arrangement: it is a plebiscitarian democracy unfolding the totalitarian potential within a democratic system. As a centralized power, it intends to perpetuate the rulers’ monopoly over the state, relying on the falsification of classical (liberal) constitutionalism. These features offer sufficient family resemblance to treat them together for the purposes of constitutional theory. Illiberal democracy takes an instrumental attitude to constitutional institutions. Amendments to the constitution take place according to the momentary interests of the political power, like in any democracy without extremely cumbersome amendment rules. The ultimate attachment to the spirit of the constitution, the idea of respecting an unamendable core, is missing. There is no commitment to underlying principles; appearances matter, not authenticity. Hence the inevitable duplicity and deceit in the constitutional and legal system of illiberal democracy. The constitution is not an entrenched, higher order law but a practical tool to solve emerging conflicts in an illiberal and nondemocratic way (imposing arbitrary will as supreme command).