He had a 'steely' determination to succeed.
a sky filled with 'steely' gray clouds
the judge's 'steely' blue eyes
(..) I told him. But he said for some reason he had no home to return to. Once Yubaba got control over him... his face turned pale and his eyes turned steely. He's never been the same. Kamajii, what if I take the gold seal back to Zeniba? I could give back the seal and apologize to her for Haku. (..)2001 Spirited Away