ἄρροπος

From LSJ

κέρκος τῇ ἀλώπεκι μαρτυρεῖ → you can tell a fox by its tail, small traits give the clue to the character of a person

Source

Spanish (DGE)

-ον
que no inclina el fiel de la balanza τριακοσ<τ>όδιν ἄρροπον IGLS 1272a (Laodicea II d.C.)
fig. de pers. imparcial de un juez, Gr.Naz.M.37.662A
de un pensamiento recto, que no se desvía Esaias Cap.spir.M.40.1212B.