50 entries under stiff topic. ×

4
set(verb, adjective, calm, strong, secure)
3
staunch(adjective, calm, strong, sound, secure)
2
adamantine(adjective, strong, tough, firm)
2
dense(adjective, strong, hard, firm, solid)
2
healthy(adjective, strong, hard, solid, heavy)
2
iron(adjective, firm, rigid)
2
rocky(adjective, firm, rigid)
2
secure(adjective, calm, strong, sound, tough)
2
sinewy(adjective, strong, hard, sound, tough)
1
athletic(adjective, strong, sound, tough, solid)
1
mighty(adjective, strong, hard, sound, tough)
1
muscular(adjective, strong, sound, tough, solid)
1
powerful(adjective, strong, sound, tough, solid)
1
resolute(adjective, calm, strong, secure, firm)
1
strapping(adjective, strong, hard, sound, tough)
0
callous(adjective, firm, rigid)
0
compact(adjective, firm, rigid)
0
compacted(adjective, firm, rigid)
0
compressed(adjective, firm, rigid)
0
concentrated(adjective, firm, rigid)
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APASmart Define. (2015). durable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/durable/thesaurus/synonyms
ChicagoSmart Define. 2015. "durable thesaurus" https://smartdefine.org/durable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, durable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/durable/thesaurus/synonyms>.
MLASmart Define. "durable thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/durable/thesaurus/synonyms>