Newman Noggs made no reply, but went on shrugging his shoulders and cracking his finger-joints; smiling horribly all the time, and looking steadfastly at nothing, out of the tops of his eyes, in a most ghastly manner.
During this conversation, Mrs Nickleby had regarded the man with a severe and steadfast look.
Newman, with a steadfast and immovable aspect, and his fixed eye very fixed indeed, replied, suiting the action to the word, ’A letter.
Mr Snawley looked steadfastly at his son for a full minute, and then covering his eyes with his hand, and once more raising his hat in the air, appeared deeply occupied in deploring his black ingratitude.
He shaded his eyes with his hand; grazed at his opponent, steadfastly, for a few moments; and, then taking the weapon which was tendered to him, bent his eyes upon that, and looked up no more until the word was given, when he instantly fired.
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.