ἀμετάπταιστος
From LSJ
ὡς αἰεὶ τὸν ὁμοῖον ἄγει θεὸς ὡς τὸν ὁμοῖον → how God ever brings like men together | birds of a feather flock together | how the god always leads like to like | as ever, god brings like and like together | as always the god brings like to like
English (LSJ)
ον,
A infallible, πρόρρησις Gal.17(1).863.
German (Pape)
[Seite 122] dasselbe, eigtl. der nicht straucheln kann, Sp.
Greek (Liddell-Scott)
ἀμετάπταιστος: -ον, μὴ ὑποπίπτων εἰς πταῖσμα, ἀναμάρτητος, Γαλην.