71 entries under firmness topic. ×

1
adherence(noun, support, control, strength, reason)
1
assurance(noun, support, control, strength, balance)
1
backbone(noun, health, support, control, force)
1
brawn(noun, health, force, body, power)
1
brawniness(noun, health, force, body, power)
1
brute force(noun, expression, health, force, body)
1
determination(noun, support, control, strength, balance)
1
establishment(noun, support, control, strength, balance)
1
fortitude(noun, health, force, body, power)
1
immovability(noun, support, control, strength, balance)
1
maturity(noun, support, control, strength, balance)
1
muscle(noun, health, force, body, power)
1
physique(noun, health, force, body, power)
1
pith(noun, health, force, body, power)
1
potency(noun, health, force, body, power)
1
pow(noun, health, force, body, power)
1
powerhouse(noun, health, force, body, power)
1
sinew(noun, health, force, body, power)
1
sock(noun, health, force, body, power)
1
stalwartness(noun, health, force, body, power)
11 years ago|9.1k views|share |citing 
APASmart Define. (2015). soundness thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/soundness/thesaurus/synonyms
ChicagoSmart Define. 2015. "soundness thesaurus" https://smartdefine.org/soundness/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, soundness thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/soundness/thesaurus/synonyms>.
MLASmart Define. "soundness thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/soundness/thesaurus/synonyms>