He saw no absurd sides to the follies of life, and thus, though not quite companionable in the eyes of merry men and scoffers, and those to whom all things show life as a jest, he was not intolerable to the earnest and those acquainted with grief.
There are no more uses of "acquaint" in the book.
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You should acquaint yourself with the new computer program.
One of the objectives in my literature class is to acquaint my students with different cultures.