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unfrivolous

adjective
un·​friv·​o·​lous | \ ˌən-ˈfri-və-ləs How to pronounce unfrivolous (audio) \

Definition of unfrivolous

: not frivolous : having real seriousness or importance an unfrivolous objection the unfrivolous matter of the national budget

First Known Use of unfrivolous

1840, in the meaning defined above

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