22
prudent(adjective, careless, reserved, cautious, imprudent)
19
heedful
17
wary(adjective, careless, certain, careful, reserved)
15
cautious(adjective, careless, reserved)
12
careful(adjective, false, loose, reserved, cautious)
9
shy(adjective, reserved, cautious)
9
guarded
8
circumspect
8
responsible(adjective, reserved, cautious)
8
smart
7
alert
7
calm
5
frugal
5
intelligent
5
scary
4
chary
4
attentive(adjective, reserved, cautious)
4
discreet(adjective, sensible, careless, stupid, reserved)
4
judicious(adjective, careless, foolish, thoughtful, wise)
4
yellow
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APASmart Define. (2015). reckless thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/reckless/thesaurus/antonyms
ChicagoSmart Define. 2015. "reckless thesaurus" https://smartdefine.org/reckless/thesaurus/antonyms (accessed September 20, 2026).
HarvardSmart Define 2015, reckless thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/reckless/thesaurus/antonyms>.
MLASmart Define. "reckless thesaurus" 3 August 2015. Web. 20 September 2026. <https://smartdefine.org/reckless/thesaurus/antonyms>