Having qualities resembling those of steel, especially hard and resolute. / Made of steel.

plural of Steely

A surname.

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

(US) A zinc-coated steel version of the one-cent coin, produced during World War II because of copper shortages. / A steel ball bearing or marble.

plural of steelie

(idiomatic) Having a hard, strong, and determined look about oneself. / (idiomatic) Having a hard, strong, and determined mentality or mindset.

A compound of iron containing less than 0.5 percent carbon.

(idiomatic) Having a hard, strong, and determined mindset, with very steady nerves; great patience and courage.

(idiomatic) Having a hard, strong, and determined mindset / mentality.