Lewis Short
(adjective) : indignābundus, a, um, indignor
* Full of indignation, enraged, indignant (not ante-Aug.): illa muliebriter indignabunda,Liv. 38, 57, 7; with clamitans,Suet. Aug. 40: animo irritato, indignabundus,Gell. 19, 9, 8.
Charlton T. Lewis, Charles Short, A Latin Dictionary