3
suddenly(adverb, straight, hastily, impulsively, recklessly)
3
unpremeditated(noun, adjective, passionate, violent, thoughtless)
3
unreasonable
3
unthinking(adjective, violent, careless, fierce, ardent)
3
urgent(adjective, adverb, quick, speedy, quickly)
2
abruptly(adverb, straight, hastily, speedily, impulsively)
2
accelerated(adjective, prompt, fast, quick, abrupt)
2
acute(adjective, sudden)
2
adventurous(adjective, careless, wild, thoughtless, impulsive)
2
agile(prompt, fast, quick, rapid, speedy)
2
ahead(adverb, forward, on, onward, forwards)
2
boisterous(adjective, haste)
2
breathless(adjective, keen, violent, anxious, eager)
2
brisk(adjective, prompt, fast, quick, speedy)
2
carelessly
2
diving(adverb, headfirst)
2
double-quick
2
eager(adjective, strong, keen, difficult, intense)
2
expeditious(prompt, fast, quick, abrupt, rapid)
2
feverish(adjective, keen, violent, anxious, eager)
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APASmart Define. (2015). headlong thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/headlong/thesaurus/synonyms
ChicagoSmart Define. 2015. "headlong thesaurus" https://smartdefine.org/headlong/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, headlong thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/headlong/thesaurus/synonyms>.
MLASmart Define. "headlong thesaurus" 3 August 2015. Web. 22 September 2026. <https://smartdefine.org/headlong/thesaurus/synonyms>