ἀνασφαλής

From LSJ

αἰθὴρ δ᾽ ἐλαφραῖς πτερύγων ῥιπαῖς ὑποσυρίζει (Aeschylus, Prometheus Bound 126) → The bright air fanned | whistles and shrills with rapid beat of wings.

Source

Spanish (DGE)

-ές
inseguro de pers. Cyr.Al.M.69.1145C
subst. τὸ ἀ. τῶν ἐτῶν lo inseguro de la edad Didym.M.39.708B.