45 entries under casual topic. ×

6
lackadaisical(adjective, dull, careless, thoughtless)
6
unobservant(noun, adjective, careless, cold, foolish)
6
unthinking(adjective, careless, indifferent, foolish, stupid)
3
imprudent(adjective, careless, indifferent, foolish, stupid)
3
incautious(adjective, indifferent, thoughtless, sloppy)
3
oblivious(noun, adjective, soft, careless, indifferent)
2
abstracted(noun, adjective, careless, thoughtless)
2
uncircumspect(happy-go-lucky, slapdash)
2
unguarded(happy-go-lucky, slapdash)
1
cursory(adjective, careless, indifferent, thoughtless)
1
inaccurate(adjective, soft, careless, common)
1
indiscreet(adjective, indifferent, thoughtless, sloppy)
1
injudicious(careless, stupid, unthinking, obtuse)
1
irresponsible(careless, criminal, negligent, happy-go-lucky)
1
mindless(careless, indifferent, stupid, unconcerned)
1
nonchalant(adjective, careless, indifferent, thoughtless)
1
offhand(adjective, careless, indifferent, thoughtless)
1
unconcerned(noun, adjective, dull, careless, indifferent)
1
unreflective(careless, stupid, unthinking, obtuse)
0
happy-go-lucky
11 years ago|12k views|share |citing 
APASmart Define. (2015). remiss thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/remiss/thesaurus/synonyms
ChicagoSmart Define. 2015. "remiss thesaurus" https://smartdefine.org/remiss/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, remiss thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/remiss/thesaurus/synonyms>.
MLASmart Define. "remiss thesaurus" 13 April 2015. Web. 30 September 2026. <https://smartdefine.org/remiss/thesaurus/synonyms>