Noun
something hard to endure
the quality of being valid and rigorous
excessive sternness
Source: WordNetLiterary criticism has about it neither rigour nor proof. Where it is honest, it is passionate, private experience seeking to persuade. George Steiner
A clear fire, a clean hearth, and the rigour of the game. Charles Lamb
Laws and principles are not for the times when there is no temptation: they are for such moments as this, when body and soul rise in mutiny against their rigour ... If at my convenience I might break them, what would be their worth? Charlotte Brontë
The rigour of science requires that we distinguish well the undraped figure of Nature itself from the gay-coloured vesture with which we clothe her at our pleasure. Heinrich Hertz
If Courtezans and Strumpets were to be prosecuted with as much Rigour as some silly People would have it, what Locks or Bars would be sufficient to preserve the Honour of our Wives and Daughters? Bernard Mandeville
Rigour is to the mathematician what morality is to men. André Weil