Matthew 9:30

ἐνεβριμήθη, the true reading for ἐνεβριμήσατο, is an instance of the forms of the middle voice gradually giving place to passive forms. In modern Greek there is no middle voice.

30. ἐμβριμᾶσθαι. Lit. ‘to roar,’ leonis voce uti (Schleusner), then (1) ‘to charge with vehement threats:’ cp. εἰ συ βριμήσαιο, Aristoph. Knights, 851, where the Scholiast explains the word τὸ ὀργίζεσθαι καὶ�, implying ‘fretful impatience,’ (Jebb on Soph. Ajax, 322); (2) ‘to enjoin strictly’ (here and Mark 1:43); (3) to be loudly indignant (Mark 14:5). In John 11:33, ἐνεβριμήσατο τῷ πνεύματι probably means, ‘felt indignation in his spirit,’ possibly, expressed indignation, ‘groaned in his spirit;’ so also John 11:38.