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безнадежность

Ὦ ξεῖν’, ἀγγέλλειν Λακεδαιμονίοις ὅτι τῇδε κείμεθα τοῖς κείνων ῥήμασι πειθόμενοι. -> Go tell the Spartans, stranger passing by, that here, obedient to their laws, we lie.
Simonides of Kea

Russian > Greek

безнадежность = ἀνέλπιστον, ἀπελπισμός, δυσελπιστία, ἀπόγνοια

(Translation based on the reversal of Dvoretsky's Ancient Greek to Russian dictionary)