THESAURUS
usurper
Simon Legree, absolute monarch, absolute ruler, all-powerful ruler, arrogator, autarch, autocrat, caesar, commissar, czar, despot, dictator, disciplinarian, driver, duce, hard master, martinet, oligarch, oppressor, pharaoh, pretender, slave driver, stickler, tyrant, warlord
ROGET THESAURUS
usurper
Undueness
N
undueness, malum prohibitum, impropriety, illegality, falseness, emptiness of title, invalidity of title, illegitimacy, loss of right, disfranchisement, forfeiture, usurpation, tort, violation, breach, encroachment, presumption, assumption, seizure, stretch, exaction, imposition, lion's share,
usurper, pretender, undue, unlawful, unconstitutional, illicit, unauthorized, unwarranted, disallowed, unallowed, unsanctioned, unjustified, unentitled, disentitled, unqualified, disqualified, unprivileged, unchartered, illegitimate, bastard, spurious, supposititious, false, usurped, tortious, undeserved, unmerited, unearned, unfulfilled, forfeited, disfranchised, improper, unmeet, unfit, unbefitting, unseemly, unbecoming, misbecoming, seemless, contra bonos mores, not the thing, out of the question, not to be thought of, preposterous, pretentious, would-be, filius nullius.