100 entries under rash topic. ×

5
precipitant(adjective, violent, careless, fast, careful)
5
sloppy(adjective, casual, happy-go-lucky, oblivious)
4
harebrained(adjective, careless, wild, silly, foolish)
4
oblivious(casual, happy-go-lucky, slapdash, neglectful)
4
tempestuous(adjective, violent, impetuous, uncontrolled)
4
unsound(foolish, risky)
3
ardent(adjective, impulsive, unthinking, excitable)
3
desperado
3
inadvisable(adjective, foolish, risky)
3
inexpedient(adjective, careless, foolish, thoughtless)
3
misguided(adjective, foolish, thoughtless, unwise)
3
short-sighted(adjective, silly, foolish, thoughtless)
3
unplanned(noun, adjective, impulsive, unthinking)
2
brazen
2
overhasty(careless, foolish, thoughtless, impulsive)
2
precipitous(impulsive, unthinking, impetuous, hasty)
2
spur-of-the-moment(noun, adjective, impulsive, unthinking)
2
unpremeditated(noun, adjective, careless, casual, thoughtless)
2
unreflecting(impulsive, unthinking)
2
unvigilant(careless, bold, thoughtless, wary)
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APASmart Define. (2015). reckless thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/reckless/thesaurus/synonyms
ChicagoSmart Define. 2015. "reckless thesaurus" https://smartdefine.org/reckless/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, reckless thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/reckless/thesaurus/synonyms>.
MLASmart Define. "reckless thesaurus" 3 August 2015. Web. 25 September 2026. <https://smartdefine.org/reckless/thesaurus/synonyms>