79 entries under substantial topic. ×

1
set in stone(expression, idiom, calm, strong)
1
sinewy(adjective, strong, sound, tough, solid)
1
solid as a rock(expression, idiom, calm, strong)
1
stabile(calm, strong, solid, steady)
1
stalwart(adjective, calm, strong, sound, secure)
1
stark(adjective, strong, sound, tough, solid)
1
stationary(calm, strong, secure, solid, steady)
1
staying put(expression, calm, strong, solid)
1
strapping(adjective, strong, sound, tough, solid)
1
tenacious(adjective, strong, sound, secure, tough)
1
together(calm, strong, solid, steady)
1
unalterable(calm, strong, solid, steady)
1
unchangeable(calm, strong, solid, steady)
1
unfluctuating(calm, strong, secure, solid, steady)
1
uniform(calm, strong, solid, steady)
1
unvarying(calm, strong, solid, steady)
1
unwavering(calm, strong, solid, steady)
1
vigorous(adjective, strong, sound, tough, solid)
0
healthy(adjective, solid, heavy, powerful)
10 years ago|5.4k views|share |citing 
APASmart Define. (2016). well-founded thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/well-founded/thesaurus/synonyms
ChicagoSmart Define. 2016. "well-founded thesaurus" https://smartdefine.org/well-founded/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, well-founded thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/well-founded/thesaurus/synonyms>.
MLASmart Define. "well-founded thesaurus" 29 March 2016. Web. 28 September 2026. <https://smartdefine.org/well-founded/thesaurus/synonyms>