Usually means: Serious, not trivial or silly.
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We found 3 dictionaries that define the word unfrivolous:

General (3 matching dictionaries)
  1. unfrivolous: Merriam-Webster
  2. unfrivolous: Collins English Dictionary
  3. unfrivolous: Wiktionary

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Definitions from Wiktionary (unfrivolous)

▸ adjective:  Not frivolous

Similar:
nonfrivolous, unfrolicsome, untrifling, unfrilly, unfractious, nonfrilly, nonperfunctory, unfanciful, futile, unfrugal, more...

Opposite:
serious, solemn, earnest, grave, mature

▸ Words similar to unfrivolous

▸ Usage examples for unfrivolous

▸ Idioms related to unfrivolous

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▸ Popular nouns described by unfrivolous

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▸ Rhymes of unfrivolous

▸ Invented words related to unfrivolous

Similar:
nonfrivolous, unfrolicsome, untrifling, unfrilly, unfractious, nonfrilly, nonperfunctory, unfanciful, futile, unfrugal, more...

Opposite:
serious, solemn, earnest, grave, mature



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