δυσελπίστως
From LSJ
οὐκ ἔστι λέουσι καὶ ἀνδράσιν ὅρκια πιστά → there are no pacts between lions and men, between lions and men there are no oaths of faith, there can be no covenants between men and lions
Russian (Dvoretsky)
δυσελπίστως: безнадежно: δ. ἔχειν или διακεῖσθαί τινι Polyb. лишиться надежды на что-л., отчаяться в чем-л.