70 entries under heedless topic. ×

45
careless(noun, adjective, feature, state, calm)
33
neglectful(noun, adjective, calm, cool, soft)
30
inattentive(noun, adjective, sharp, rude, careless)
27
thoughtless(adjective, feature, state, easy, sharp)
25
unmindful(noun, adjective, soft, easy, sharp)
21
forgetful(adjective, soft, careless, cold, indifferent)
18
reckless(adjective, feature, state, easy, sharp)
15
inconsiderate(adjective, sharp, rude, careless, cold)
11
regardless(adjective, soft, careless, cold, indifferent)
10
imprudent(adjective, easy, careless, wild, foolish)
10
rash(adjective, easy, sharp, rude, careless)
10
unthinking(adjective, sharp, rude, careless, indifferent)
10
unwary(adjective, cold, forget, thoughtless, uncaring)
10
unwatchful(adjective, adverb, careless, cold, forget)
8
oblivious(noun, adjective, soft, careless, indifferent)
7
devil-may-care(adjective, feature, state, soft, careless)
5
brash(adjective, sharp, rude, careless, indifferent)
5
improvident(adjective, careless, casual, bold, thoughtless)
5
unconscious(adjective, careless, indifferent, apathetic, thoughtless)
4
unguarded(careless, casual, bold, thoughtless, wary)
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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>