amethystinus
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
Latin > English (Lewis & Short)
ămĕthystĭnus: a, um, adj. amethystus.
I Of the color of amethyst: vestes, Mart. 1, 97, 7.—Also absol.: amethystina (sc. vestimenta), * Juv. 7, 136.—
II Set or adorned with amethyst: trientes, Mart. 10, 49.