LSJ
ητος, ἡ, dimness, αἰσθήσεων Gal. 11.282; obscurity, Epist. Maximini ap. Eus. DE 9.7, cf. Eust. 1585.47.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ητος, ἡ, Schwäche, Euseb.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)