férreo

Etymology
.

Adjective

 * 1)  iron, ferrous
 * 2) persistent, determined, tenacious

Etymology
Borrowed from.

Adjective

 * 1)  iron, ferrous
 * 2) persistent, determined, tenacious

Etymology
.

Adjective

 * 1)  iron
 * 2) persistent, determined, tenacious
 * 3) powerful, hard
 * 4)  from the Iron Age
 * 1)  from the Iron Age