14
loyal(adjective, characteristic, close, correct, continue)
14
tenacious(adjective, strong, free, secure, tough)
13
hastily(adverb, quickly, rapidly, pronto)
12
apace(adverb, quickly, rapidly, pronto)
12
briskly(adverb, intensely, fiercely, quickly, rapidly)
12
dissipated(adjective, open, light, free, evil)
12
faithful(adjective, characteristic, close, correct, continue)
12
lickety-split(adjective, adverb, informal, fast, quick)
12
pronto(adjective, adverb, informal, immediately, quickly)
11
loose(adjective, open, light, evil, relaxed)
11
active(adjective, keen, express, energetic, quick)
11
immovable(adjective, strong, secure, firm, solid)
11
libertine(adjective, open, light, evil, relaxed)
11
licentious(adjective, open, light, free, evil)
11
promptly(adverb, quickly, rapidly, pronto)
11
snappy(adjective, prompt, irritable, quick, rapid)
11
staunch(adjective, calm, close, strong, secure)
10
fastened(adjective, strong, sound, secure, firm)
10
breakneck(adjective, adverb, violent, quick, speedy)
10
close(adjective, adverb, strong, correct, warm)
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APASmart Define. (2016). fast thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/fast/thesaurus/synonyms
ChicagoSmart Define. 2016. "fast thesaurus" https://smartdefine.org/fast/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, fast thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/fast/thesaurus/synonyms>.
MLASmart Define. "fast thesaurus" 1 April 2016. Web. 21 September 2026. <https://smartdefine.org/fast/thesaurus/synonyms>