rigour

Noun
  1. The quality of being valid and rigorous (synset 104790831)
  2. Something hard to endure (synset 104717403)
    "the asperity of northern winters"
  3. Excessive sternness (synset 104647089)
    "severity of character"; "the harshness of his punishment was inhuman"; "the rigors of boot camp"

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