72 entries under difficulty topic. ×

10
hardness(noun, support, control, power, strength)
10
harshness(noun, force, power, easy)
8
severity(noun, power, easy, condition)
7
difficulty(noun, discipline, strictness, hardness)
7
stiffness(noun, firmness, protection, security)
6
formidability
5
arduousness(noun, discipline, strictness, hardness)
5
rigorousness(noun, easy, condition, discipline)
5
roughness(noun, power, violence)
4
complication(noun, hardness)
4
strenuousness(noun, hardness, tedium, arduousness)
4
tightness
3
complexity
3
onerousness
3
oppressiveness
2
adversity(noun, hardness)
2
laboriousness
2
trickiness
2
wearying
1
cantankerousness
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APASmart Define. (2015). toughness thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/toughness/thesaurus/synonyms
ChicagoSmart Define. 2015. "toughness thesaurus" https://smartdefine.org/toughness/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, toughness thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/toughness/thesaurus/synonyms>.
MLASmart Define. "toughness thesaurus" 21 December 2015. Web. 22 September 2026. <https://smartdefine.org/toughness/thesaurus/synonyms>