The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Hellenic*ə-
- Ancient Greekἀ- (a-)
- Ancient Greekσθένος (sthénos)
- Ancient Greekἀσθενής (asthenḗs)
- English todayastheno-
From Ancient Greek ἀσθενής (asthenḗs).
Etymology from Wiktionary, CC BY-SA 4.0.