6
goofy
1
minor
0
birdbrained
0
dizzy
0
featherbrained
0
fiddling
0
flighty
0
foolish
0
frivolous
0
frothy
0
futile
0
giddy
0
harebrained
0
incidental
0
inconsequential
0
inconsiderable
0
insignificant
0
light-headed
0
light-minded
0
little
<12>
13 years ago|212 views|share |citing 
APASmart Define. (2013). unfrivolous thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/unfrivolous/thesaurus/antonyms
ChicagoSmart Define. 2013. "unfrivolous thesaurus" https://smartdefine.org/unfrivolous/thesaurus/antonyms (accessed September 29, 2026).
HarvardSmart Define 2013, unfrivolous thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/unfrivolous/thesaurus/antonyms>.
MLASmart Define. "unfrivolous thesaurus" 28 June 2013. Web. 29 September 2026. <https://smartdefine.org/unfrivolous/thesaurus/antonyms>