decidedly vs definitely

decidedly and definitely both are adverbs.

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

As adverbs, decidedly and definitely are synonyms defined as:

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

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