13
thoughtless(adjective, characteristic, thoughtlessness, silliness)
11
impulsive(adjective, characteristic, spontaneity, improvisation)
11
spontaneous(adjective, characteristic, spontaneity, improvisation)
9
unthinking(adjective, characteristic, thoughtlessness, silliness)
8
absent-minded(adjective, characteristic, thoughtlessness, silliness)
8
extemporaneous(adjective, characteristic, spontaneity, improvisation)
8
spur-of-the-moment(adjective, characteristic, spontaneity, improvisation)
8
unplanned(adjective, characteristic, spontaneity, improvisation)
8
unprompted(adjective, characteristic, spontaneity, improvisation)
8
unstructured(adjective, characteristic, spontaneity, improvisation)
7
heedless(adjective, characteristic, thoughtlessness, silliness)
7
silly(adjective, characteristic, thoughtlessness, silliness)
7
unmindful(adjective, characteristic, thoughtlessness, silliness)
7
unreflective(adjective, characteristic, thoughtlessness, silliness)
6
empty-headed(adjective, characteristic, thoughtlessness, silliness)
6
mindless(adjective, characteristic, thoughtlessness, silliness)
6
neglectful(adjective, characteristic, thoughtlessness, silliness)
6
reckless(adjective, characteristic, thoughtlessness, silliness)
6
senseless(adjective, characteristic, thoughtlessness, silliness)
6
stupid(adjective, characteristic, thoughtlessness, silliness)
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APASmart Define. (2015). ruminative thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/ruminative/thesaurus/antonyms
ChicagoSmart Define. 2015. "ruminative thesaurus" https://smartdefine.org/ruminative/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2015, ruminative thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/ruminative/thesaurus/antonyms>.
MLASmart Define. "ruminative thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/ruminative/thesaurus/antonyms>