utterly vs perfectly

utterly and perfectly both are adverbs.

Word	Noun	Adjective	Verb	Adverb
utterly	No	No	No	Yes
perfectly	No	No	No	Yes

As adverbs, utterly and perfectly are synonyms defined as:

utterly and perfectly: completely and without qualification; used informally as intensifiers

Other synonyms of utterly include absolutely, dead.

utterly (adverb)	perfectly (adverb)
completely and without qualification; used informally as intensifiers	completely and without qualification; used informally as intensifiers
	in a perfect or faultless way