From Longman Dictionary of Contemporary Englishindignantin‧dig‧nant /ɪnˈdɪɡnənt/ adjective ANGRYSURPRISEDangry and surprised because you feel insulted or unfairly treatedindignant at/about Liz was indignant at the way her child had been treated. an indignant reply —indignantly adverb ‘Of course I didn’t tell her!’ Sasha said indignantly.
Examples from the Corpus
indignant• At the moment people are being indignant about literary biographies and the nasty things they are saying about their subjects.• John would be indignant and angry on my behalf but it would change things if he knew.• Eric was indignant at being told he would have to wait two weeks for an appointment.• Jess felt faintly indignant at the remark.• He was indignant his comrades had not shot her on the spot.• Grandfather's always writing indignant letters to the newspaper.• There were indignant shouts from the priests.• He had sent it to a top producer at Spelling Entertainment who was indignant that Hein had the gall to plagiarize.• I began to dislike her; she looked sly and I felt indignant that she'd spoken to me like that.• The members of the branch were indignant that the government should have planted two spies among them.indignant at/about• It saw only the incomprehensible inaction of the Army of the Potomac, and was indignant at it.• At the moment people are being indignant about literary biographies and the nasty things they are saying about their subjects.• This makes it harder to wax indignant at the ideas being canvassed in Washington.• Jess felt faintly indignant at the remark.Origin indignant (1500-1600) Latin present participle of indignari, from indignus “unworthy” 