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
P. and V. εὐτυχῶς, εὐδαιμόνως, μακαρίως.
(turn out) happily: use also P. and V. εὖ, καλῶς, V. αἰσίως.
felicitously, adv.: P. and V. εὐπρεπῶς, συμμέτρως.