10
dashing(adjective, fashion, casual, quick, confident)
10
express(adjective, direct, keen, prompt, energetic)
10
immediate(adjective, direct, prompt, quick, rapid)
10
instantaneous(adjective, direct, prompt, quick, immediate)
10
solid(verb, adjective, adverb, calm, strong)
10
sudden(adjective, irritable, quick, abrupt, speedy)
10
sure(adjective, calm, close, strong, secure)
10
wanton(adjective, open, light, free, evil)
9
alert(adjective, activity, keen, bright, energetic)
9
fasting(noun, adjective, diet)
9
hurriedly(adverb, quickly, rapidly, pronto)
9
lightning
9
like a shot(expression, idiom, adverb, quickly, rapidly)
9
secured(adjective, strong, secure, substantial, stable)
9
sturdy(adjective, calm, strong, tough, firm)
8
immoral(adjective, free, evil, informal, wild)
8
brief(adjective, violent, short, casual, quick)
8
abandoned(adjective, open, light, free, evil)
8
accelerated(adjective, direct, keen, express, prompt)
8
degenerate(adjective, open, light, evil, loose)
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APASmart Define. (2016). fast thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fast/thesaurus/synonyms
ChicagoSmart Define. 2016. "fast thesaurus" https://smartdefine.org/fast/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, fast thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fast/thesaurus/synonyms>.
MLASmart Define. "fast thesaurus" 1 April 2016. Web. 22 September 2026. <https://smartdefine.org/fast/thesaurus/synonyms>