17
careful(adjective, false, loose, reckless, painstaking)
14
well-versed
11
cautious(adjective, careful, attentive, reckless, responsible)
11
prudent(adjective, action, thought, wise, attentive)
9
mindful(adjective, quiet, aware, attentive, responsible)
9
scrupulous(adjective, loose, careful, sloppy, attentive)
8
attentive(adjective, responsible)
8
guarded(verb, adjective, attentive, responsible)
7
painstaking(adjective, unconcerned, attentive, thorough, meticulous)
7
frugal
7
shy
6
thoughtful(adjective, happy, caring, attentive, superficial)
5
chary(adjective, careful, cautious)
5
concerned(adjective, attentive, responsible)
5
conscientious(adjective, careful, thorough)
5
meticulous(adjective, false, detailed, perfectionist)
5
overprotective
5
vigilant(adjective, indifferent, careful, watchful)
4
observant(adjective, alert, watchful, unobservant)
4
accurate(adjective, attentive, responsible)
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APASmart Define. (2016). careless thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/careless/thesaurus/antonyms
ChicagoSmart Define. 2016. "careless thesaurus" https://smartdefine.org/careless/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2016, careless thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/careless/thesaurus/antonyms>.
MLASmart Define. "careless thesaurus" 3 March 2016. Web. 23 September 2026. <https://smartdefine.org/careless/thesaurus/antonyms>