if you say you will become a millionaire i will doubtfully say no. it means i dont think something will happen or i dont think you will do something.
Doubtfully is the correct spelling.
The adjective form of doubtfully is doubtful.
The professor raised his eyebrows, showing how doubtfully he was receiving my explanation.
Yes, it is an adverb. it is the adverb form of doubtful (doubting).
Doubtfully
Doubtfully
Doubtfully.
doubtfully, uncertainly
Suspiciously, distrustfully, doubtfully.
Antonyms: doubtfully, gloomily, hopelessly
With an attitude or look of suspicion or disapproval.ex: "the reformers looked askance at the mystical tradition"synonyms:suspiciously, skeptically, cynically, mistrustfully, distrustfully,doubtfully, dubiously
The opposite could be unsure, or uncertain.