There was something so captivating in his light way of touching these fantastic strings, and he was such a mirthful child by the side of the graver childhood we had seen, that he made my guardian smile even as he turned towards us from a little private talk with Mrs. Blinder.
There are no more uses of "mirth" in the book.
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It was an evening of many stories and great mirth.
He felt no mirth or humor and wondered if there’d ever be a time again when he would.