Synonyms for Indignant:

adj.

angry (adjective)
furious, pissed off, exasperated, upset, angry, irritated, mad, irate, Piqued, enraged, displeased, incensed, annoyed.

n.

cross, fed up, annoyed, upset, belligerent, put out. feelings, sore, hot under the collar, choleric. incensed (noun)
Piqued.
indignant (noun)
incensed, umbrageous, outraged, angry.

Other synonyms:

sore, choleric. Other relevant words:
angry, upset, belligerent, annoyed, outraged, choleric, umbrageous, hot under the collar, cross, Piqued, sore, feelings.

Usage examples for indignant

  1. It was so late that she could only listen in vain at the top of the stairs before she went into the room, where she found Sibby very indignant at having missed all the excitement of the night past. – The Pillars of the House, V1 by Charlotte M. Yonge
  2. Oh, don't be so indignant please. – His Second Wife by Ernest Poole
  3. But every time the idea came to me that Joseph was a girl, I felt indignant with myself. – The Priest, The Woman And The Confessional by Father Chiniquy