SINCE 1828
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
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Merriam-Webster unabridged
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