unfrivolous

adjective
un·friv·o·lous | \ ˌən-ˈfri-və-ləs \

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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The first known use of unfrivolous was in 1840

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