informal vs unofficial

informal and unofficial both are adjectives.

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

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