The difference between Doubtlessly and Indubitably
When used as adverbs, doubtlessly means without question, whereas indubitably means in a manner that leaves no possibility of doubt.
check bellow for the other definitions of Doubtlessly and Indubitably
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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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Indubitably as an adverb:
In a manner that leaves no possibility of doubt; undoubtedly.