ὀπισθοδάκτυλος
From LSJ
εἰς πέλαγος σπέρµα βαλεῖν καὶ γράµµατα γράψαι ἀµφότερος µόχθος τε κενὸς καὶ πρᾶξις ἄκαρπος → throwing seeds and writing letters at sea are both a vain and fruitless endeavor
English (LSJ)
ον,
A with fingers bent backwards, Str.2.1.9.
German (Pape)
[Seite 358] mit zurückgebogenen Fingern, Strab. 2, 1, 9, als fabelhaftes Volk.