2
unthrifty(adjective, improvident)
2
unvigilant(adjective, careless, bold, thoughtless, impulsive)
2
unwise(adjective, careless, thoughtless, inconsiderate, imprudent)
2
unwitting(adjective, careless, unconcerned, sloppy, slack)
2
unworried(adjective, feature, state, indifferent, trait)
1
absorbed
1
airheaded(adjective, careless, vague, sloppy, slack)
1
amnemonic(adjective, careless, vague, sloppy, slack)
1
amnesic(adjective, careless, unconcerned, sloppy, slack)
1
annotate
1
any old way(expression, idiom, careless, bold, thoughtless)
1
any way(expression, soft, tolerant, slack, lenient)
1
apathetical(adjective, cold, dead, apathy, passive)
1
approximate
1
approximative
1
asleep at switch(expression, adjective, idiom, adverb, slow)
1
asleep at the switch(expression, adjective, idiom, adverb, careless)
1
asleep on job(soft, careless, tolerant, slack, lenient)
1
asleep on the job(expression, adjective, idiom, careless, sluggish)
1
ataractic
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APASmart Define. (2015). negligent thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/negligent/thesaurus/synonyms
ChicagoSmart Define. 2015. "negligent thesaurus" https://smartdefine.org/negligent/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, negligent thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/negligent/thesaurus/synonyms>.
MLASmart Define. "negligent thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/negligent/thesaurus/synonyms>