0
intense
0
intensive
0
interior
0
internal
0
intervening
0
intimidating
0
intricate
0
intrinsic
0
invaluable
0
inventive
0
irredeemable
0
irremediable
0
irreparable
0
irretrievable
0
irreversible
0
jammed
0
job
0
judicious
0
knotty
0
laid back(expression, indecorous)
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APASmart Define. (2015). frivolous thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/frivolous/thesaurus/antonyms
ChicagoSmart Define. 2015. "frivolous thesaurus" https://smartdefine.org/frivolous/thesaurus/antonyms (accessed September 29, 2026).
HarvardSmart Define 2015, frivolous thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/frivolous/thesaurus/antonyms>.
MLASmart Define. "frivolous thesaurus" 13 April 2015. Web. 29 September 2026. <https://smartdefine.org/frivolous/thesaurus/antonyms>