definitely vs unquestionably

definitely and unquestionably both are adverbs.

Word	Noun	Adjective	Verb	Adverb
definitely	No	No	No	Yes
unquestionably	No	No	No	Yes

As adverbs, definitely and unquestionably are synonyms defined as:

Other synonyms of definitely include by all odds, decidedly, emphatically, in spades.

definitely (adverb)	unquestionably (adverb)
without question and beyond doubt	without question
	without question and beyond doubt