rigor

Strictness or severity, as in action or judgment.

A harsh or trying circumstance; a hardship or difficulty: synonym: difficulty.

A harsh or severe act.

Strictness in adhering to standards or a method; exactitude.

A standard or exacting requirement, as of a field of study.

Shivering or trembling, as caused by a chill.

A state of rigidity in living tissues or organs that prevents response to stimuli.

Stiffness or rigidity.