unfamiliar vs unacquainted

unfamiliar and unacquainted both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unfamiliar	No	Yes	No	No
unacquainted	No	Yes	No	No

unfamiliar (adjective)	unacquainted (adjective)
not known or well known	having little or no knowledge of
	not knowledgeable about something specified