20
inattentive(noun, adjective, careless, cold, indifferent)
17
heedless(noun, adjective, careless, cold, indifferent)
15
careless(noun, adjective, cold, indifferent, foolish)
14
unmindful(noun, adjective, careless, cold, indifferent)
11
negligent(noun, adjective, careless, cold, casual)
11
unheeding(verb, adjective, careless, cold, careful)
10
neglectful(noun, adjective, careless, cold, indifferent)
10
regardless(adjective, adverb, careless, cold, foolish)
9
absent-minded(noun, adjective, careless, cold, foolish)
9
inadvertent(adjective, careless, cold, foolish, stupid)
9
thoughtless(adjective, careless, cold, indifferent, foolish)
8
inobservant(adjective, careless, cold, forget, uncaring)
8
oblivious(noun, adjective, careless, indifferent, casual)
8
unwatchful(adjective, careless, cold, forget, uncaring)
7
distrait(noun, adjective, careless, cold, forget)
7
incurious(adjective, cold, forget, uncaring, inattentive)
7
unseeing(adjective, dull, careless, indifferent, thoughtless)
6
blind(adjective, careless, indifferent, apathetic, unconcerned)
6
forgetful(adjective, cold, careful, forget, uncaring)
6
remiss(noun, adjective, careless, cold, foolish)
<1234510>
11 years ago|3.1k views|share |citing 
APASmart Define. (2015). unobservant thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/unobservant/thesaurus/synonyms
ChicagoSmart Define. 2015. "unobservant thesaurus" https://smartdefine.org/unobservant/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, unobservant thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/unobservant/thesaurus/synonyms>.
MLASmart Define. "unobservant thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/unobservant/thesaurus/synonyms>