18
severity(noun, easy, condition, discipline, firmness)
16
stringency(noun, easy, condition, discipline, firmness)
15
sternness(noun, easy, condition, discipline, firmness)
14
harshness(noun, easy, condition, discipline, firmness)
13
hardness(noun, easy, condition, discipline, firmness)
12
hardship(noun, trouble, easy, blow, difficulty)
11
asperity(noun, easy, difficulty, want, mess)
11
austerity(noun, trouble, easy, condition, want)
11
inclemency(noun, severity, harshness, strictness, exactness)
11
precision(noun, care, firmness, truth, distinction)
10
permanence(firmness, rigidity, stiffness)
10
rigidity(noun, easy, condition, discipline, firmness)
9
rigour
8
accuracy(noun, care, truth, severity, harshness)
8
adversity(noun, trouble, blow, difficulty, distress)
8
rigorousness(noun, easy, condition, discipline, firmness)
8
stiffness(noun, firmness, severity, harshness, strictness)
8
strictness(noun, easy, care, condition, discipline)
7
cruelty(noun, discipline, firmness, severity, harshness)
7
exactness(noun, care, truth, distinction, refinement)
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APASmart Define. (2015). rigor thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/rigor/thesaurus/synonyms
ChicagoSmart Define. 2015. "rigor thesaurus" https://smartdefine.org/rigor/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, rigor thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/rigor/thesaurus/synonyms>.
MLASmart Define. "rigor thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/rigor/thesaurus/synonyms>