triftig
From LSJ
ὀδοῦσι καὶ ὄνυξι καὶ πάσῃ μηχανῇ → tooth and nail | tooth, fang, and claw | in every possible way | by hook or by crook
triftig, iustus (gehörig). – probabilis (billigenswert). – gravis (gewichtig; alle z.B. causa). – potens (wirksam, durchschlagend, z.B. argumentum, probatio).