The difference between Indubitably and Unquestionably
When used as adverbs, indubitably means in a manner that leaves no possibility of doubt, whereas unquestionably means without question.
check bellow for the other definitions of Indubitably and Unquestionably
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Indubitably as an adverb:
In a manner that leaves no possibility of doubt; undoubtedly.
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Unquestionably as an adverb:
without question; beyond doubt; indubitably.
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Unquestionably as an adverb (informal):
OK, right-on