noun

rigor

rigour, severity, hardship, thoroughness

The course was taught with academic rigor.

The course was taught with academic rigour.

They survived the rigors of the arctic winter.

They survived the rigours of the arctic winter.

the ((rigour)) of (sth.) the rigour of the training

Synonyms: strictness, severity, thoroughness; Antonyms: leniency, flexibility

From Latin 'rigor', meaning 'stiffness, harshness'.

Think of the 'rigor' of a 'rigid' training schedule. The spelling 'rigour' is common in British English.

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