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Webster 1913 Edition

Noun.

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.

Noun.

Want of acquaintance or familiarity; want of knowledge; followed by with; as an utter unacquaintance with his design.

unacquaintance ‎(uncountable)

The state or condition of being unacquainted; unfamiliarity with something.
He was then in happy unacquaintance with everything connected with that obnoxious cavity. — Sir W. Hamilton.