71 entries under casual topic. ×

8
regardless(adjective, careless, indifferent, thought)
7
perfunctory(adjective, quick, happy-go-lucky, slapdash)
7
remiss(adjective, indifferent, unconcerned, obtuse)
6
inadvertent(adjective, indifferent, unconcerned, rash)
6
unconsidered(noun, adjective, careless, foolish, careful)
6
disregardful(adjective, rash, happy-go-lucky, oblivious)
6
unconcerned(adjective, feature, state, careless, indifferent)
5
loose(adjective, careless, wild, foolish)
5
offhand(noun, adjective, careless, thoughtless)
5
slipshod(adjective, careless, happy-go-lucky, arbitrary)
5
sloppy(adjective, rash, happy-go-lucky, oblivious)
4
happy-go-lucky(adjective, feature, state, careless, trait)
4
oblivious(rash, happy-go-lucky, slapdash, neglectful)
4
sudden(noun, careless, quick, thoughtless)
4
unheeding(indifferent, unconcerned, unkind, inconsiderate)
4
unreflective(adjective, obtuse, happy-go-lucky, slapdash)
4
wasteful(adjective, free, careless, indifferent, wild)
3
lax(adjective, feature, state, careless, indifferent)
3
spontaneous(noun, adjective, careless, thoughtless)
2
absent-minded(obtuse, happy-go-lucky, slapdash, unperceptive)
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APASmart Define. (2015). reckless thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/reckless/thesaurus/synonyms
ChicagoSmart Define. 2015. "reckless thesaurus" https://smartdefine.org/reckless/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, reckless thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/reckless/thesaurus/synonyms>.
MLASmart Define. "reckless thesaurus" 3 August 2015. Web. 26 September 2026. <https://smartdefine.org/reckless/thesaurus/synonyms>