“Iniquitous” is a synonym for “wrong,” but you wouldn’t use it in the context of someone getting the wrong answer on a math test. This adjective has a powerful connotation related to the moral quality or fairness of something. To declare a judgment as iniquitous is to claim in formal terms that it’s profoundly immoral or unjust in some way. Don’t use the word “iniquitous” lightly, but if you have strong convictions and you feel they have been violated, this adjective will carry that weight.