200 entries under solid topic. ×

3
concrete(adjective, strong, hard, physical)
3
energetic(adjective, strong, sound, tough)
3
fastened(adjective, strong, secure, firm)
3
mighty(adjective, strong, sound, tough)
3
muscular(adjective, strong, sound, tough)
3
serene(adjective, calm, quiet, smooth, soft)
3
sinewy(adjective, strong, sound, tough)
3
single-minded(adjective, firm, fixed, resolute)
3
steady-going(adjective, continue, firm, steady)
3
true-blue(adjective, good, strong, honest)
3
well-constructed(complete, vigorous, sturdy)
3
well-made(adjective, strong, sound, tough)
2
bound(adjective, close, strong, flat, firm)
2
careful(good, strong, steady, consistent)
2
heavy(adjective, strong, hard, sound, tough)
2
honest(adjective, strong, reasonable, fair)
2
iron(adjective, strong, safe, sheltered)
2
physical(adjective, strong, hard, material)
2
right(adjective, direct, sound, complete, smooth)
2
rooted(adjective, strong, hard, secure)
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APASmart Define. (2015). stable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/stable/thesaurus/synonyms
ChicagoSmart Define. 2015. "stable thesaurus" https://smartdefine.org/stable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, stable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/stable/thesaurus/synonyms>.
MLASmart Define. "stable thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/stable/thesaurus/synonyms>