THESAURUS
undue
a bit much, abandoned, aberrant, abnormal, abominable, atrocious, boundless, criminal, cutthroat, delinquent, deviant, disgraceful, dizzy, egregious, enormous, evil, exacting, exaggerated, excessive, exorbitant, extortionate, extravagant, extreme, fabulous, fancy, gigantic, gluttonous, gouging, grossly overpriced, hardly the thing, high, hyperbolic, hypertrophied, ignominious, ill-timed, illegal, immoderate, improper, inappropriate, inapt, incontinent, incorrect, indecorous, inept, inequitable, infamous, inflationary, iniquitous, inordinate, intemperate, monstrous, nonmeritorious, not coming, not done, not outstanding, not the thing, off-base, off-color, out of bounds, out of sight, out-of-line, outrageous, overbig, overdeveloped, overgreat, overgrown, overlarge, overmuch, overpriced, overweening, preposterous, prohibitive, sacrilegious, scandalous, shameful, shameless, sinful, skyrocketing, spiraling, steep, stiff, terrible, too much, towering, unapt, unbalanced, unbridled, unconscionable, undeserved, undeserving, unearned, unentitled, unequal, unequitable, uneven, unfit, unfitting, unjust, unjustifiable, unjustified, unlawful, unmeasurable, unmeet, unmerited, unmeriting, unowed, unowing, unreasonable, unrestrained, unrighteous, unrightful, unseasonable, unseemly, unsuitable, untimely, unwarrantable, unwarranted, unworthy, usurious, wicked, wrong, wrongful
ROGET THESAURUS
undue
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.