θρασύφρων
From LSJ
αἰθὴρ δ᾽ ἐλαφραῖς πτερύγων ῥιπαῖς ὑποσυρίζει (Aeschylus, Prometheus Bound 126) → The bright air fanned | whistles and shrills with rapid beat of wings.
English (LSJ)
ον, gen. ονος,
A bold of mind, Opp.H.1.112.
German (Pape)
[Seite 1216] ον, kühnherzig, Opp. Hal. 1, 112 Qu. Sm. 1, 4, öfter.