Adverb
In a doubtful manner.
Source: Webster's dictionary"I wonder if you can understand the 'fun' of making a beautiful thing, the pride and satisfaction of it, and the holiness!" The company glanced doubtfully at one another. In Gopher Prairie it is not good form to be holy except at church, between ten-thirty and twelve on Sunday. Sinclair Lewis
She glared at him. "I'm not weird like that. I'm good weird. I'm cool weird.” "Yes,” he said doubtfully. "Yes, you are. Derek Landy
By the Declaration of Independence, dreaded by the foes an for a time doubtfully viewed by many of the friends of America, everything stood on a new and more respectable footing, both with regard to the operations of war or negotiations with foreign powers. Mercy Otis Warren
The sense of an entailed disadvantage the deformed foot doubtfully hidden by the shoe, makes a restlessly active spiritual yeast, and easily turns a self-centered, unloving nature into an Ishmaelite. George Eliot
Gerald shook his head doubtfully Source: Internet