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

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

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Definitions from Wiktionary (nonfrivolous)

▸ adjective:  (law) Not frivolous.

Similar:
unfrivolous, nonfelonious, noncriminal, nonvexatious, nonnegligent, futile, nonperfunctory, untrifling, unfrolicsome, nonfrilly, more...

Opposite:
serious, substantial, significant, weighty, important

▸ Words similar to nonfrivolous

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Similar:
unfrivolous, nonfelonious, noncriminal, nonvexatious, nonnegligent, futile, nonperfunctory, untrifling, unfrolicsome, nonfrilly, more...

Opposite:
serious, substantial, significant, weighty, important



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