Extended Strong's Greek Lexicon (Abbott-Smith based)
be indignant
Usage: ἀγανακτέω, -ῶ (ἄγαν, much, ἄχομαι, to grieve), [in LXX: Wis.5:22, 12:27, Da TH Bel 28, 4Ma.4:21 * ;] to be indignant: Mat.21:15, 26:8, Mrk.10:14, 14:4; before περί, Mat.20:24, Mrk.10:41; before ὅτι, Luk.13:14 (see MM, VGT, see word).† (AS)