569 entries under adjective topic. ×

17
perpetual(strain, firmness, labour, hardiness)
17
robust(strain, firmness, labour, hardiness)
17
sturdily(adverb, strain, firmness, labour)
16
secure(verb, calm, strong, free)
16
set(calm, strong, secure, tough)
16
proof(noun, strain, firmness, labour)
16
resilient(strain, firmness, labour, hardiness)
16
rock-solid(strain, firmness, labour, hardiness)
16
immune(strain, firmness, safe, labour)
16
long-standing(strain, firmness, labour, hardiness)
15
debauched(open, light, evil, wild)
15
impregnable(strain, firm, firmness, constant)
15
flying(keen, energetic, active, speedy)
15
profligate(open, light, free, evil)
15
prompt(adverb, activity, direct, keen)
14
loyal(characteristic, close, correct, continue)
14
tenacious(strong, free, secure, tough)
12
dissipated(open, light, free, evil)
12
faithful(characteristic, close, correct, continue)
12
lickety-split(adverb, informal, fast, quick)
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APASmart Define. (2016). fast thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/fast/thesaurus/synonyms
ChicagoSmart Define. 2016. "fast thesaurus" https://smartdefine.org/fast/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, fast thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/fast/thesaurus/synonyms>.
MLASmart Define. "fast thesaurus" 1 April 2016. Web. 25 September 2026. <https://smartdefine.org/fast/thesaurus/synonyms>