3
unperceptive(adjective, inattentive, blind, obtuse)
3
unregardful(adjective, cold, forget, uncaring, inattentive)
3
unsolicitous(adjective, cold, forget, uncaring, inattentive)
3
unthoughtful(adjective, cold, forget, uncaring, inattentive)
2
absent(adjective, careless, indifferent, apathetic, unconcerned)
2
abstracted(noun, adjective, careless, casual, thoughtless)
2
cursory(casual, inattention, happy-go-lucky, slapdash)
2
disregardful(casual, rash, happy-go-lucky, oblivious, slapdash)
2
dozy(adjective, careless, distracted, abstracted, daydreaming)
2
dreamy(adjective, careless, indifferent, apathetic, unconcerned)
2
eyeless
2
ignorant(adjective, indifferent, unconcerned, insensitive, unaware)
2
insensible(adjective, unaware)
2
listless(adjective, careless, indifferent, apathetic, distracted)
2
offhand(casual, inattention, happy-go-lucky, slapdash)
2
out to lunch(expression, adjective, idiom, careless, indifferent)
2
reckless(adjective, casual, rash, obtuse, happy-go-lucky)
2
unnoticing(adjective, careless, indifferent, apathetic, unconcerned)
2
unobserving(adjective, careless, indifferent, apathetic, distracted)
1
absentminded(adjective, careless, indifferent, apathetic, unconcerned)
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APASmart Define. (2015). unobservant thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unobservant/thesaurus/synonyms
ChicagoSmart Define. 2015. "unobservant thesaurus" https://smartdefine.org/unobservant/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, unobservant thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unobservant/thesaurus/synonyms>.
MLASmart Define. "unobservant thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/unobservant/thesaurus/synonyms>