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) 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 rigorousness 
