indignant

angered at something unjust or wrong

Affected with indignation; wrathful; passionate; irate; feeling wrath, as when a person is exasperated by unworthy or unjust treatment, by a mean action, or by a degrading accusation.

Latin 'indignare' - to regard with indignation or resent

“A pretty little housemaid replied, with an indignant flush, that she was the person.”

— George Meredith, Complete Project Gutenberg Works of George Meredith

“The Youth International Party (YIP) and Students for a Democratic Society (SDS) emerged in Li'l Abner as "Students Wildly Indignant about Nearly Everything!" (SWINE).”