informal vs unceremonious

informal and unceremonious both are adjectives.

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

informal (adjective)	unceremonious (adjective)
not formal	without due formalities
used of spoken and written language	without ceremony or formality
having or fostering a warm or friendly and informal atmosphere
not officially recognized or controlled