200 entries under solid topic. ×

5
hardy(adjective, strong, sound, tough)
5
hearty(adjective, strong, sound, complete, tough)
5
motionless(adjective, calm, dull, quiet, strong)
5
poised(adjective, calm, quiet, easy, firm)
5
sensible(adjective, sound, reasonable, moderate, firm)
5
tenacious(adjective, strong, sound, secure, tough)
5
unswerving(adjective, firm, fixed, resolute)
5
vigorous(adjective, strong, sound, complete, tough)
5
well-founded(adjective, strong, sound, secure, tough)
4
cool(adjective, calm, quiet, sound, reasonable)
4
dense(adjective, close, strong, hard, firm)
4
hale(adjective, strong, sound, complete, tough)
4
imperturbable(adjective, calm, smooth, firm)
4
intact(complete, clean, pure, vigorous)
4
predictable(adjective, good, strong, honest)
4
sober(adjective, calm, quiet, sound, reasonable)
4
unfaltering(adjective, firm, steady, regular)
4
vital(adjective, strong, complete, vigorous)
4
well-built(adjective, strong, sound, tough, firm)
3
able-bodied(adjective, strong, sound, tough)
11 years ago|31k views|share |citing 
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>