kakistocracy
Government under the control of a nation's worst or least-qualified citizens.
Therefore we need not make any scruple of praying against […] those restlesse spirits who can no longer live, then be stickling and medling; who are stung with a perpetuall itch of changing and innovating, transforming our old Hierarchy into a new Presbytery, and this againe into a newer Independency; and our well-temperd Monarchy into a mad kinde of Kakistocracy.
Where it comes from
From Ancient Greek κάκιστος (kákistos, “worst”), superlative of κακός (kakós, “bad”) + -κρατία (-kratía, “power, rule, government”) (corresponding to -cracy). The word was used, perhaps re-coined, by the English author Thomas Love Peacock (1785–1866) in his 1829 novella The Misfortunes of Elphin as the opposite of aristocracy (see second quotation).
Adapted from the Wiktionary entry kakistocracy (CC BY-SA 4.0).