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Use "unmirthful" in a sentence
"The distressing explanation she had to make to Harriet, and all that poor Harriet would be suffering, with the awkwardness of future meetings, the difficulties of continuing or discontinuing the acquaintance, of subduing feelings, concealing resentment, and avoiding eclat, were enough to occupy her in most unmirthful reflections some time longer, and she went to bed at last with nothing settled but the conviction of her having blundered most dreadfully."
"He looked at her and a sudden cynical amusement gleamed in his eyes -- an amusement so bitterly unmirthful that there seemed something almost brutal about it."
"A grim unmirthful smile parted Robert Grell's lips."