snotty-nosed vs insolent

snotty-nosed and insolent both are adjectives.

Word	Noun	Adjective	Verb	Adverb
snotty-nosed	No	Yes	No	No
insolent	No	Yes	No	No

As adjectives, snotty-nosed and insolent are synonyms defined as:

Other synonyms of snotty-nosed include flip, impudent.

snotty-nosed (adjective)	insolent (adjective)
marked by casual disrespect	marked by casual disrespect
	unrestrained by convention or propriety