άογκος

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

Greek Monolingual

ἄογκος, -ον (Α)
1. αυτός που δεν έχει μεγάλο όγκο, λεπτός
2. όποιος δεν έχει μάζα ή όγκο.