Indignation
late Middle English (also in the sense ‘disdain, contempt’): from Latin indignatio(n- ), from indignari ‘regard as unworthy’.
wiktionary
From Middle English indignacioun, borrowed from Old French indignation, from Latin indignātiō, from indignor(“to scorn, resent”), from indignus(“unworthy, not fitting”), from in-(“not”) + dignus(“worthy, appropriate”). Attested since ca. 1374. Doublet of indignatio.
etymonline
indignation (n.)
c. 1200, from Old French indignacion "fury, rage; disrespect," or directly from Latin indignationem (nominative indignatio) "indignation, displeasure; a provocation, cause for indignation," noun of action from past participle stem of indignari "regard as unworthy, be angry or displeased at," from indignus "unworthy," from in- "not, opposite of" (see in- (1)) + dignus "worth (n.), worthy, proper, fitting," from PIE *dek-no-, suffixed form of root *dek- "to take, accept." The indignation meeting (1835) once was a common American way to express popular outrage by passing and publishing resolutions.
