4
audacious(adjective, careless, wild, bold, thoughtless)
4
brash(adjective, wild, quick, thoughtless, rash)
4
bustling(adjective, hasty)
4
excessive(adjective, fast)
4
feverish(adjective, energetic, hasty)
4
hectic(adjective, rash)
4
hot(adjective, bad, heavy, quick, treacherous)
4
hurrying(adjective, fast)
4
impatient(adjective, violent, fast, irritable, quick)
4
injudicious(adjective, rash)
4
irresponsible(adjective, wild, bold, thoughtless, rash)
4
light-footed(adjective, fast)
4
lightning
4
posthaste(adjective, adverb, hot, fast, quick)
4
prompt(adjective, fast, quick, rapid, speedy)
4
sudden(adjective, keen, sharp, energetic, active)
4
wild(adjective, thoughtless, daring, deed, carefree)
3
darting(adjective, hasty)
3
desperado(adjective, rash)
3
devil-may-care(adjective, careless, wild, bold, thoughtless)
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APASmart Define. (2016). breakneck thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/breakneck/thesaurus/synonyms
ChicagoSmart Define. 2016. "breakneck thesaurus" https://smartdefine.org/breakneck/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, breakneck thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/breakneck/thesaurus/synonyms>.
MLASmart Define. "breakneck thesaurus" 1 April 2016. Web. 23 September 2026. <https://smartdefine.org/breakneck/thesaurus/synonyms>