spontaneous
From LSJ
καὶ ὑποθέμενος κατὰ τῆς κεφαλῆς φέρειν τὰς πληγάς, ὡς ἐν ἐκείνῃ τοῦ τε κακοῦ τοῦ πρὸς ἀνθρώπους → and having instructed them to bring their blows against the head, seeing that the harm to humans ... (Josephus, Antiquities of the Jews 1.50)
English > Greek (Woodhouse)
adjective
automatic, acting of itself: P. and V. αὐτόματος.
voluntary: P. and V. ἑκούσιος, αὐθαίρετος, αὐτεπάγγελτος.