51 entries under toughness topic. ×

67
stability(noun, law, support, control, honor)
47
firmness(noun, support, control, honor, character)
36
constancy(noun, support, control, run, character)
35
endurance(noun, support, control, honor, character)
35
solidity(noun, law, support, control, character)
33
steadiness(noun, support, control, character, strength)
25
persistence(noun, character, strength, trait, resolution)
24
soundness(noun, support, control, character, strength)
22
fastness(noun, support, control, character, strength)
22
strength(noun, support, control, character, trait)
22
substantiality(noun, law, support, control, character)
21
robustness(noun, character, strength, trait, firmness)
19
hardness(noun, support, control, character, strength)
18
durability(noun, support, control, time, strength)
16
steadfastness(noun, support, control, strength, balance)
16
imperishability(noun, character, strength, trait, will)
11
resoluteness(noun, support, control, character, strength)
9
lastingness(noun, strength, resolution, fortitude, stamina)
9
staying power(noun, expression, strength, resolution, fortitude)
8
solidness(noun, support, control, strength, balance)
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APASmart Define. (2015). permanence thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/permanence/thesaurus/synonyms
ChicagoSmart Define. 2015. "permanence thesaurus" https://smartdefine.org/permanence/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, permanence thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/permanence/thesaurus/synonyms>.
MLASmart Define. "permanence thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/permanence/thesaurus/synonyms>