185 entries under strong topic. ×

5
tenacious(adjective, sound, secure, tough)
5
undeviating(adjective, quiet, direct, smooth)
5
vigorous(adjective, sound, complete, tough)
5
well-founded(adjective, sound, secure, tough)
4
dense(adjective, close, hard, firm)
4
formidable
4
hale(adjective, sound, complete, tough)
4
predictable(adjective, good, honest, solid)
4
vital(adjective, complete, solid, vigorous)
4
well-built(adjective, sound, tough, firm)
3
able-bodied(adjective, sound, tough, solid)
3
concrete(adjective, hard, solid, physical)
3
energetic(adjective, sound, tough, solid)
3
fastened(adjective, secure, firm, solid)
3
husky(adjective, hard, substantial, sturdy)
3
mighty(adjective, sound, tough, solid)
3
muscular(adjective, sound, tough, solid)
3
persevering(adjective, flat, determined, definite)
3
potent(adjective, sound, tough, firm)
3
resolved(adjective, flat, determined, thoughtful)
11 years ago|31k views|share |citing 
APASmart Define. (2015). stable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/stable/thesaurus/synonyms
ChicagoSmart Define. 2015. "stable thesaurus" https://smartdefine.org/stable/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, stable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/stable/thesaurus/synonyms>.
MLASmart Define. "stable thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/stable/thesaurus/synonyms>