exceedingly vs extremely

exceedingly and extremely both are adverbs.

Word	Noun	Adjective	Verb	Adverb
exceedingly	No	No	No	Yes
extremely	No	No	No	Yes

As adverbs, exceedingly and extremely are synonyms defined as:

Other synonyms of exceedingly include deathly, super.

exceedingly (adverb)	extremely (adverb)
to an extreme degree	to an extreme degree
	to a high degree or extent; favorably or with much respect