Stephen looked at him with some little irresolution for a moment, and then seemed to make up his mind.
If she had asserted any influence over him beyond her plain faith in the truth and right of what she said; if she had concealed the least doubt or irresolution, or had harboured for the best purpose any reserve or pretence; if she had shown, or felt, the lightest trace of any sensitiveness to his ridicule or his astonishment, or any remonstrance he might offer; he would have carried it against her at this point.
There are no more uses of "irresolute" in the book.
Show samples from other sources
When I came to you last week and found you alone, I came determined to know the truth; though irresolute what to do when it WAS known.
Austen, Jane -- Sense and Sensibility
He was near the door now, barely two feet away from me where I stood at the threshold, irresolute, not knowing whether to forge on toward my room or to turn and flee.