Inacquaintance

[…] so in asthma, where there is no expuition, or the expuition does not appear till the paroxysm is subsiding, we ought, I think, in fair reason, rather to acknowledge or inacquaintance with the actual cause than to place our faith in one that has so little to support it.

He could scarcely have advanced a theory indicating a more unfortunate inacquaintance with the subject.

It is a form of which George Eliot seems especially fond: her young ladies refuse the most ineligible offers out of devotion to their aunts; her young gentlemen have all the arduous inacquaintance with Latin which their education requires […]