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comparative more doubtfully, superlative most doubtfully
In a doubtful manner, in context of doubt or ambiguity, questionably. quotations examples
He looked at the mauve envelope doubtfully, and examined the postmark. "Where is Pudlington, James? and one might almost ask—why is Pudlington? No town has any right to such an offensive name."
1920, Herman Cyril McNeile, chapter 1, in Bulldog Drummond