doubtingly

He looked rather doubtingly—rather confused; said something about “honour,”—glanced at Emma and at Harriet, and then seeing the book open on the table, took it up, and examined it very attentively.

But builders laborer Silvio Veiga, 49, looked doubtingly at the rotten ironwork protruding from one of the hotel’s supporting concrete pillars.

I therefore can only venture distantly and doubtingly to allude to it, as one of the points at which it appears to me that innovation is visibly and audibly at work.

“I will speak,” she thought, when the old voice ventured doubtingly, “Mrs. Dorlan's?”

"Oh, Arnold, that is all too improbable," she rejoined doubtingly.