adjective. Not being acquainted; not conversant.

adjective. Not within one's knowledge; strange.

Not familiar; not well known or acquainted; not wonted by frequent use.

adjective. Strange, not familiar.

noun. An unfamiliar person; a stranger.

adjective. not known or well known

"These gentlemen were using a phrase unfamiliar to many in northern and eastern linguistic regions but easily understood by “country” talkers and especially black Americans; it is deeply rooted in the usages of some of the great contributors to the English language."

common  familiar  

strange  unacquainted  unacquainted with  unfamiliar with  unknown  

familiar  

distant  distinctive  exotic  familiar  frighten  

able  awkward  bizarre  bizarre  blankminded