μεγᾰλο-φρονέω · megalo-phroneō — LSJ
to be high-minded, μ. ἐφʼ ἑαυτῷ to be confident in oneself, X. HG 6.2.39; πρὸς τὰς ἀνάγκας LXX 4 Ma. 6.24; to be generous, D.C. 43.21, al.:—Med., display high spirit, περὶ τῆς ἡγεμονίας J. AJ 19.3.1.
in bad sense, to be arrogant, Plu. Dio 40, al.:—in Med., Pl. R. 528c; ἐπί τινι D.C. 43.14; τινι Philostr. VA 8.5; πρός τινα . . ὡς . . ib. 1.39.