12 entries under careless topic. ×

10
unaware(adjective, unobservant)
5
inattentive(adjective, attention, concerned, negligent)
4
thoughtless(adjective, reasonable, prudent, unobservant)
4
unmindful(adjective, unobservant)
3
heedless(adjective, careful, unobservant)
3
indifferent(adjective, unobservant)
3
neglectful(adjective, unobservant)
3
negligent(adjective, unobservant)
3
unobservant(adjective, observant)
1
unwatchful(adjective, concerned, unobservant)
0
undiscriminating(adjective, unobservant)
0
wanton
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APASmart Define. (2016). observant thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/observant/thesaurus/antonyms
ChicagoSmart Define. 2016. "observant thesaurus" https://smartdefine.org/observant/thesaurus/antonyms (accessed September 28, 2026).
HarvardSmart Define 2016, observant thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/observant/thesaurus/antonyms>.
MLASmart Define. "observant thesaurus" 29 March 2016. Web. 28 September 2026. <https://smartdefine.org/observant/thesaurus/antonyms>