un·friv·o·lous
| \ ˌən-ˈfri-və-ləs
\
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Definition of unfrivolous
: not frivolous : having real seriousness or importance
an unfrivolous objection the unfrivolous matter of the national budget
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“Unfrivolous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unfrivolous. Accessed 24 Jun. 2022.
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Time Traveler for unfrivolous
The first known use of unfrivolous was in 1840
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