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unmirthful

adjective
un·​mirthful | \¦ən+\

Definition of unmirthful 

: not mirthful : serious, humorless glanced around a tableful of sober, unmirthful faces— Caroline Ticknor

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First Known Use of unmirthful

1782, in the meaning defined above

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The first known use of unmirthful was in 1782

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