σκληρόω
From LSJ
ζηλοῦτε δὲ τὰ χαρίσματα τὰ μείζονα. Καὶ ἔτι καθ᾽ ὑπερβολὴν ὁδὸν ὑμῖν δείκνυμι (1 Corinthians 12:31) → But go ahead and strive for the greater gifts. And I'm about to show you a still more excellent way.
English (LSJ)
harden, in Pass., Xenocr. ap. Orib.2.58.28.
German (Pape)
[Seite 901] hart machen, härten, abhärten, Sp.
French (Bailly abrégé)
-ῶ :
rendre dur.
Étymologie: σκληρός.