Instantly all the indignations which had been dominating him and the spiritual dramas through which he had struggled became pallid and absurd before the ancient and overwhelming realities, the standard and traditional realities, of sickness and menacing death, the long night, and the thousand steadfast implications of married life.
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.