ἐναντίωσις
From LSJ
ἄνθρωπος ὢν ἥμαρτον· οὐ θαυμαστέον → being human I made a mistake; there is nothing remarkable about it
English (LSJ)
εως, ἡ,
A opposition, Th. 8.50, Pl.R.454a; in social intercourse, Arist.EN1126b34; opposition, Sammelb.5356.25 (iv A. D.). 2 disagreement, discrepancy, Isoc.12.203 (pl.), Pl.R.607c, etc.: pl., contrarieties, Arist.Metaph.986b1, al.
German (Pape)
[Seite 827] ἡ, das Entgegnen, der Widerspruch, Thuc. 5, 80; Folgde, auch im plur., Plat. Soph. 259 b; Isocr. 12, 203.