perfectly vs utterly

perfectly and utterly both are adverbs.

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

As adverbs, perfectly and utterly are synonyms defined as:

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

Other synonyms of perfectly include absolutely, dead.

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