The noun rigor means high standards.

Synonyms are accuracy, austerity, hardship, or harshness.

The word origins from Old French (14th century) rigor meaning “strength, hardness”, from Modern French (13th century) rigueur, and from Latin rigorem meaning “numbness, stiffness, hardness, firmness, roughness, rudeness”, from rigēre meaning “be stiff”, from PIE root *reig- meaning “stretch, be stretched, be stiff”.

We need to maintain academic rigor through this process.

There are some jobs that demand a uniform sturdy enough to stand up to daily rigor and activity.

The arguments are provocative but at times lack rigor.