περιθύμως ἔχειν
From LSJ
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
Dutch (Woordenboekgrieks.nl)
περιθύμως = woedend:. περιθύμως ἔχειν = woedend zijn Hdt. 2.162.5.