26
fixed(adjective, adverb, strong, complete, secure)
26
constant(adjective, calm, close, strong, sound)
26
steady(adjective, adverb, calm, close, strong)
26
hasty(adjective, prompt, violent, quick, abrupt)
25
settled(adjective, strong, secure, strain, firm)
25
stout(adjective, calm, strong, tough, strain)
24
invariable(adjective, strain, firmness, labour, hardiness)
24
stationary(adjective, strain, firmness, labour, hardiness)
23
fleet(adjective, adverb, prompt, quick, abrupt)
22
brisk(adjective, prompt, quick, speedy, hasty)
22
rigid(adjective, complete, secure, strain, firm)
21
dissolute(adjective, free, evil, informal, wild)
21
hurried(adjective, violent, quick, abrupt, brisk)
21
resistant(adjective, strain, firmness, labour, hardiness)
21
tenable(adjective, strain, firmness, labour, hardiness)
20
refractory(adjective, strain, firmness, labour, hardiness)
20
stabile(adjective, calm, strong, secure, strain)
20
unalterable(adjective, strain, firmness, labour, hardiness)
20
unyielding(adjective, strong, secure, tough, strain)
19
well-balanced(adjective, strain, firmness, labour, hardiness)
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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>