1. (noun) asperity, grimness, hardship, rigor, rigour, severity, severeness, rigorousness, rigourousness
something hard to endure
Synonyms: hardness, cogency, hard knocks, severeness, rigor, austereness, harshness, gruesomeness, asperity, luridness, rigour, stiffness, inclemency, badness, adversity, hardship, rigorousness, sharpness, grimness, severity, rigourousness, ghastliness, validity
2. (noun) cogency, validity, rigor, rigour
the quality of being valid and rigorous
Synonyms: cogency, severeness, rigor, robustness, hardiness, harshness, hardness, asperity, stiffness, validness, inclemency, hardship, rigorousness, lustiness, grimness, severity, rigourousness, rigour, validity
3. (noun) severity, severeness, harshness, rigor, rigour, rigorousness, rigourousness, inclemency, hardness, stiffness
excessive sternness
Synonyms: insensibility, ruggedness, callosity, grimness, awkwardness, severeness, rigor, unfeelingness, austereness, harshness, hardness, asperity, stiffness, callousness, scratchiness, roughness, cogency, gracelessness, inclemency, inclementness, badness, bad weather, hardship, rigorousness, cruelty, cruelness, clumsiness, abrasiveness, severity, rigourousness, rigour, validity
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Synonyms for rigor 
