185 entries under strong topic. ×

1
adamant(adjective, secure, flat, determined)
1
at ease(expression, calm, easy, relaxed)
1
athletic(adjective, sound, tough, solid)
1
big(adjective, sound, tough, solid)
1
brick wall(expression, adjective, hard, steady)
1
buttoned down(expression, adjective, solid, safe)
1
candid(adjective, good, reasonable, honest)
1
capable(adjective, sound, tough, solid)
1
closed(adjective, calm, quiet, secure)
1
decent(adjective, good, reasonable, fair)
1
definite(adjective, good, easy, flat)
1
easy(adjective, calm, quiet, soft)
1
exact(adjective, calm, smooth, flat)
1
forceful(adjective, sound, tough, solid)
1
forcible(adjective, sound, tough, solid)
1
fortified(adjective, firm, solid, true)
1
good(consistent, trustworthy, steadfast, dependable)
1
hard as nails(expression, adjective, idiom, sound)
1
heavy-duty(adjective, sound, tough, solid)
1
hefty(adjective, hard, solid, big)
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APASmart Define. (2015). stable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/stable/thesaurus/synonyms
ChicagoSmart Define. 2015. "stable thesaurus" https://smartdefine.org/stable/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, stable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/stable/thesaurus/synonyms>.
MLASmart Define. "stable thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/stable/thesaurus/synonyms>