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Use "mirthfulness" in a sentence
"It is true that on such occasions he was not conspicuous for any special mirthfulness; but his good-humour had always been somewhat subdued in character."
"Herr Klüber, for his part, did everything he supposed conducive to the mirthfulness of the company; he begged them to sit down in the shade of a spreading oak-tree, and taking out of a side pocket a small booklet entitled, ‘Knallerbsen; oder du sollst und wirst lachen!’"
"Their mirthfulness and kindliness are most winning; their horses, food, clothes, and time are all bestowed on one so freely, and one lives amongst them with a most restful sense of absolute security."