rigourousness in WordNet English dictionary

1. something hard to endure
   "the asperity of northern winters"
   asperity  grimness  hardship  rigor  rigour  severity  severeness  rigorousness  rigourousness 
   
2. excessive sternness
   "severity of character"; "the harshness of his punishment was inhuman"; "the rigors of boot camp"
   severity  severeness  harshness  rigor  rigour  rigorousness  rigourousness  inclemency  hardness  stiffness