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poco de fiar

Γηράσκω δ᾽ αἰεὶ πολλὰ διδασκόμενος -> I grow old always learning many things
Solon the Athenian

Spanish > Greek

ἄκριτος, ἄπιστος, ἀθεσία, ἀπίθανος

(Translation based on the reversal of DGE)