rigour

Noun

• excessive sternness
  • severity of character
    
  • the harshness of his punishment was inhuman
    
  • the rigors of boot camp
    

• something hard to endure
  • the asperity of northern winters
    

• the quality of being valid and rigorous

Related words

• Synonyms: 
  asperity , grimness , hardship , rigor , severity , severeness , rigorousness , rigourousness , cogency , validity