ἀνυπόστολος
From LSJ
καὶ παρὰ δύναμιν τολμηταὶ καὶ παρὰ γνώμην κινδυνευταὶ καὶ ἐν τοῖς δεινοῖς εὐέλπιδες → they are bold beyond their strength, venturesome beyond their better judgment, and sanguine in the face of dangers
English (LSJ)
ον,
A using no concealment, frank, fearless, ῥήτωρ Poll.4.21; τὸ ἀ. τῆς ὀργῆς J.AJ16.3.1. Adv. -λως D.Chr.13.16, Phld.Rh.1.109S., Alciphr.3.39, etc.
German (Pape)
[Seite 266] unverhohlen, ohne Scheu, Sp., wie Ios.; auch adv. -στόλως, z. B. ὁμιλεῖν Alciphr. 3, 39.