What is the meaning of severeness?

noun

• Used of the degree of something undesirable e. G. Pain or weather.
  • synonyms: badness, severity
• Something hard to endure.
  • usage: "the asperity of northern winters"
  • synonyms: asperity, grimness, hardship, rigor, rigour, severity, rigorousness, rigourousness
• Extreme plainness.
  • synonyms: austereness, severity
• Excessive sternness.
  • usage: "severity of character"; "the harshness of his punishment was inhuman"; "the rigors of boot camp"
  • synonyms: severity, harshness, rigor, rigour, rigorousness, rigourousness, inclemency, hardness, stiffness