The difference between Doubtlessly and Undoubtedly
When used as adverbs, doubtlessly means without question, whereas undoubtedly means without doubt.
check bellow for the other definitions of Doubtlessly and Undoubtedly
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Doubtlessly as an adverb (sometimes, proscribed):
Without question; indubitably.
Examples:
"There are doubtlessly more insects than mammals."
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Undoubtedly as an adverb:
Without doubt; definitely.