rigour

noun7

1. •
   Severity or strictness.
2. •
   Harshness, as of climate.
3. •
   Character of being unyielding or inflexible.
4. •
   Higher level of difficulty.
5. •
   (informal) Ellipsis of rigor mortis.

   • Heat always upped the rate at which rigor gripped a corpse. — 2005
6. •
   A feeling of cold with shivering accompanied by a rise in body temperature.
7. •
   Shrewd questioning.