And the oncommonest workman can’t show himself oncommon in a gridiron,— for a gridiron IS a gridiron," said Joe, steadfastly impressing it upon me, as if he were endeavouring to rouse me from a fixed delusion, "and you may haim at what you like, but a gridiron it will come out, either by your leave or again your leave, and you can’t help yourself—"
There are no more uses of "steadfast" in the book.
Show samples from other sources
But then, that’s who Helene is: Her faith is steadfast.
Sabaa Tahir -- An Ember in the Ashes
Moving apace with the river was a long single-file line of men, eyes aimed at their feet, shoulders tense, walking steadfastly nowhere.