unacquaintance ['ʌnә'kweintәns]
n.
不熟悉
不相识
不知
无知
Unacquaintance \Un`ac*quaint"ance\, n.
The quality or state of being unacquainted; want of
acquaintance; ignorance.
He was then in happy unacquaintance with everything
connected with that obnoxious cavity. --Sir W.
Hamilton.