132 entries under tough topic. ×

98
strong(adjective, calm, clear, strong, hard)
96
stable(adjective, strong, hard, complete, secure)
92
firm(noun, adjective, calm, strong, hard)
61
substantial(adjective, calm, strong, hard, complete)
54
robust(adjective, health, strong, complete, secure)
48
stout(adjective, calm, strong, right)
48
fast(adjective, calm, strong, secure)
47
durable(adjective, calm, strong, secure)
47
steady(adjective, calm, quiet, strong, secure)
40
enduring(adjective, calm, strong, secure)
39
constant(adjective, calm, strong, secure)
39
unyielding(adjective, strong, hard, strain)
33
solid(verb, adjective, calm, good, clear)
26
healthy(adjective, health, good, clear, strong)
25
hale(adjective, health, good, strong, complete)
24
well(noun, adjective, adverb, health, good)
21
dependable(adjective, good, clear, strong)
21
reliable(adjective, calm, good, clear, strong)
19
sturdy(adjective, calm, strong, hard, complete)
18
fit(verb, adjective, health, good, check)
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APASmart Define. (2016). sound thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/sound/thesaurus/synonyms
ChicagoSmart Define. 2016. "sound thesaurus" https://smartdefine.org/sound/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, sound thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/sound/thesaurus/synonyms>.
MLASmart Define. "sound thesaurus" 24 March 2016. Web. 30 September 2026. <https://smartdefine.org/sound/thesaurus/synonyms>