steeliness

uncountable

toughness, hardness or durability resembling (or likened to) that of steel.

Japanese Meaning

鋼鉄のような強靭さ / 鋼鉄のような硬さ / 鋼鉄のような耐久性

Her steeliness in the face of criticism earned her the respect of the entire team.

批判に直面しても示した鋼のような強さが、チーム全員の尊敬を集めた。

Sense（1）

toughness, hardness or durability resembling (or likened to) that of steel.

He had a steeliness of eye that tended to cow people who acted tough.