ἀνεπίδηλος
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
English (LSJ)
ον,
A not manifest or observable, Ptol.Harm.1.4.
Greek (Liddell-Scott)
ἀνεπίδηλος: -ον, ὁ μὴ ἐπίδηλος, ὁ μὴ φανερός, ἀπαρατήρητος, Πτολ. Μουσ. 1. 4.