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What is the opposite of unfrivolous?

Need antonyms for unfrivolous? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
Silly in a childish way
“This is neither the time nor place for any of your silly antics.”
Adjective
Too small or unimportant to be worth consideration
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“It is hardly worth my time listening to you pontificate on a matter as insignificant as this.”
Adjective
Fickle in nature
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