(a.) Characterized by iniquity; unjust; wicked; as, an iniquitous bargain; an iniquitous proceeding.

abominable arrant atrocious bad baleful base bitchy black blamable blameworthy criminal cussed damnable dark disgraceful evil evildoing execrable felonious flagitious flagrant foul harmful hateful heinous illegal immoral improper inequitable infamous invidious knavish low malefactory malefic maleficent malfeasant malicious malign malignant mean monstrous nasty naughty nefarious noxious ornery peccant rank reprehensible reprobate scandalous shameful sinful unbalanced undeserved undue unequal unequitable uneven unforgivable unjust unlawful unmeet unmerited unpardonable unrightful unspeakable unworthy vicious vile villainous wicked wrong wrongdoing wrongful