45 entries under happy-go-lucky topic. ×

30
unmindful(adjective, careless, cold, attention, casual)
26
negligent(adjective, careless, cold, indifferent, casual)
24
heedless(adjective, careless, cold, casual, forget)
21
careless(adjective, cold, foolish, stupid, casual)
19
thoughtless(adjective, careless, cold, foolish, stupid)
18
inconsiderate(adjective, careless, cold, casual, forget)
17
unthinking(adjective, careless, indifferent, foolish, stupid)
15
absent-minded(adjective, careless, cold, foolish, stupid)
15
remiss(adjective, careless, cold, foolish, stupid)
13
unheeding(adjective, careless, cold, casual, forget)
12
forgetful(adjective, careless, cold, casual, forget)
12
regardless(adjective, adverb, careless, cold, indifferent)
9
reckless(adjective, indifferent, casual, unconcerned, rash)
8
casual(adjective, careless, indifferent, surprise, sloppy)
8
oblivious(adjective, careless, indifferent, casual, apathetic)
8
unobservant(adjective, careless, cold, foolish, stupid)
7
disregardful(adjective, careless, indifferent, casual, thoughtless)
5
slapdash(adjective, careless, indifferent, casual, thoughtless)
5
slipshod(adjective, careless, indifferent, casual, sloppy)
5
unconcerned(adjective, careless, indifferent, coarse, casual)
<123>
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APASmart Define. (2015). inadvertent thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/inadvertent/thesaurus/synonyms
ChicagoSmart Define. 2015. "inadvertent thesaurus" https://smartdefine.org/inadvertent/thesaurus/synonyms (accessed October 2, 2026).
HarvardSmart Define 2015, inadvertent thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/inadvertent/thesaurus/synonyms>.
MLASmart Define. "inadvertent thesaurus" 13 April 2015. Web. 2 October 2026. <https://smartdefine.org/inadvertent/thesaurus/synonyms>