13
severity(noun, easy, condition, discipline, firmness)
11
rigor(noun, easy, condition, discipline, firmness)
10
rigour
10
strictness(noun, easy, condition, discipline, firmness)
9
grimness(noun, discipline, firmness, severity, harshness)
8
hardness(noun, easy, condition, discipline, firmness)
8
harshness(noun, easy, condition, discipline, firmness)
7
hardship(noun, difficulty, laboriousness, strenuousness)
7
rigidity(noun, easy, condition, discipline, firmness)
7
stiffness(noun, difficulty, firmness, rigidity, inflexibility)
6
asperity(noun, harshness, sternness)
6
meticulousness(noun, distinction, refinement, severity, correctness)
6
nicety(noun, point, distinction, correctness, precision)
6
stringency(noun, easy, condition, discipline, firmness)
5
austerity(noun, easy, condition, discipline, firmness)
5
exactness(noun, distinction, refinement, correctness, precision)
4
accuracy(noun, correctness, precision, fastidiousness)
4
inclemency
4
inflexibility(noun, firmness, severity, strictness, rigidity)
4
precision(noun, distinction, refinement, correctness, accuracy)
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APASmart Define. (2015). rigorousness thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/rigorousness/thesaurus/synonyms
ChicagoSmart Define. 2015. "rigorousness thesaurus" https://smartdefine.org/rigorousness/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, rigorousness thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/rigorousness/thesaurus/synonyms>.
MLASmart Define. "rigorousness thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/rigorousness/thesaurus/synonyms>