informal vs unceremonial

informal and unceremonial both are adjectives.

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

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