unofficial vs informal

unofficial and informal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unofficial	No	Yes	No	No
informal	No	Yes	No	No

unofficial (adjective)	informal (adjective)
not having official authority or sanction	not formal
not officially established	used of spoken and written language
	having or fostering a warm or friendly and informal atmosphere
	not officially recognized or controlled