Synonyms|648Antonyms|154|Broader|16Narrower|18Related|740

56 entries under adjective topic. ×

10
unaware(careless, unobservant)
6
careless
5
absentminded
5
inattentive(careless, attention, concerned, negligent)
4
oblivious
4
thoughtless(reasonable, careless, prudent, unobservant)
4
unmindful(careless, unobservant)
3
heedless(careless, careful, unobservant)
3
indifferent(careless, unobservant)
3
neglectful(careless, unobservant)
3
negligent(careless, unobservant)
3
unobservant(careless, observant)
2
blind
2
incautious
2
lax
2
unwary
1
disobedient(defiant, mischievous)
1
forgetful
1
haphazard
1
hasty
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APASmart Define. (2016). observant thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/observant/thesaurus/antonyms
ChicagoSmart Define. 2016. "observant thesaurus" https://smartdefine.org/observant/thesaurus/antonyms (accessed September 26, 2026).
HarvardSmart Define 2016, observant thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/observant/thesaurus/antonyms>.
MLASmart Define. "observant thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/observant/thesaurus/antonyms>