INDIGNANT
indignant, incensed, outraged, umbrageous
(adjective) angered at something unjust or wrong; “an indignant denial”; “incensed at the judges’ unfairness”; “a look of outraged disbelief”; “umbrageous at the loss of their territory”
Source: WordNet® 3.1
Etymology
Adjective
indignant (comparative more indignant, superlative most indignant)
Showing anger or indignation, especially at something unjust or wrong.
Synonyms
• angry, infuriated, mad, resentful
Source: Wiktionary
In*dig"nant, a. Etym: [L. indignans, -antis, p. pr. of indignari to
be indignant, disdain. See Indign.]
Definition: 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.
He strides indignant, and with haughty cries To single fight the
fairy prince defies. Tickell.
Source: Webster’s Unabridged Dictionary 1913 Edition