128 entries under sturdy topic. ×

1
reinforced(adjective, strong, sound, tough, solid)
1
serene(adjective, calm, quiet, light, smooth)
1
set in stone(expression, adjective, idiom, calm, strong)
1
sinewy(adjective, strong, sound, tough, fit)
1
solid as a rock(expression, adjective, idiom, calm, strong)
1
stark(adjective, strong, sound, tough, solid)
1
unchangeable(adjective, calm, strong, secure, firm)
1
uniform(adjective, calm, strong, secure, firm)
0
unvarying(adjective, calm, strong, secure, firm)
0
alive and kicking(expression, idiom, complete, solid, vigorous)
0
allegiant(adjective, firm, solid, stable, fixed)
0
ardent(adjective, firm, solid, enthusiastic, vigorous)
0
changeless(adjective, firm, solid, stable, fixed)
0
entire(complete, solid, vigorous)
0
flawless(complete, solid, vigorous)
0
immovable(adjective, strong, firm, solid, stable)
0
intact(complete, solid, vigorous)
0
levelheaded(adjective, firm, solid, stable, fixed)
0
liege(adjective, firm, solid, stable, fixed)
0
loyal(adjective, firm, solid, stable, fixed)
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APASmart Define. (2016). substantial thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/substantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "substantial thesaurus" https://smartdefine.org/substantial/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, substantial thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/substantial/thesaurus/synonyms>.
MLASmart Define. "substantial thesaurus" 24 March 2016. Web. 26 September 2026. <https://smartdefine.org/substantial/thesaurus/synonyms>