unheilbar
From LSJ
ἐὰν οὖν τὰ μαλακὰ σκληρῶς καὶ τὰ σκληρὰ μαλακῶς λέγηται, πιθανὸν γίγνεται → but if, as a result, gentle things are said harshly and harsh things gently, the result is unpersuasive
German > Latin
unheilbar, insanabilis (z.B. Krankheit, Wunde). – desperatus (von dem Arzte aufgegeben, hoffnungslos, v. Krankheiten u. Kranken). – unh. sein, sanari non posse (auch bildl., z.B. eius causa sanari non potest).