εὐκαρδίως
From LSJ
Ἓν οἶδα, ὅτι οὐδὲν οἶδα → I know only one thing, that I know nothing | all I know is that I know nothing.
French (Bailly abrégé)
adv.
d'un cœur ferme.
Étymologie: εὐκάρδιος.
Russian (Dvoretsky)
εὐκαρδίως: мужественно, стойко Eur.