ταχύβουλος
From LSJ
ψυχῆς ἀγῶνα τὸν προκείμενον πέρι δώσων → to stand the appointed trial for his life, to stand the appointed struggle for life and death
English (LSJ)
ον,
A hasty in counsel, opp. μετάβουλος, perh. with allusion to the votes respecting Mytilene (Th.3.36), Ar.Ach.630; cf. Max.76.
German (Pape)
[Seite 1076] von schnellem Entschluß, den Entschluß schnell ändernd, Ἀθηναῖοι, Ar. Ach. 605.