The difference between Undoubtedly and Undoubtfully
When used as adverbs, undoubtedly means without doubt, whereas undoubtfully means undoubtedly, without doubt.
check bellow for the other definitions of Undoubtedly and Undoubtfully
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Undoubtedly as an adverb:
Without doubt; definitely.
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Undoubtfully as an adverb:
undoubtedly, without doubt