ἐρωτητέον
From LSJ
οἷς πρόθεσίς ἐστιν ἀδικεῖν, παρ' αὐτοῖς οὐδὲ δικαία ἀπολογία ἰσχύει → not even a just excuse means anything to those bent on injustice | the tyrant will always find a pretext for his tyranny | any excuse will serve a tyrant
English (LSJ)
verb. Adj.
A one must ask, ἐρώτημα Arist.APo.77b7.
Greek (Liddell-Scott)
ἐρωτητέον: ῥημ. ἐπίθ. τοῦ ἐρωτῶ, δεῖ ἐρωτᾶν, Ἀριστ. Ἀναλυτ. Ὕστ. 1. 12, 2.