ἐξ ὀνύχων λέοντα τεκμαίρεσθαι → judge by the claws, judge by a slight but characteristic mark, small traits give the clue to the character of a person, deduce something from a small indication, identify a lion from its claws
per-dignus: a, um, adj.,
I very worthy; with abl.: homo perdignus tuā amicitiā, Cic. Fam. 13, 6, 4.
perdignus, a, um, très digne : Cic. Fam. 13, 6, 4.