rigorousness

rig·or·ous  (rgr-s)

adj.

1. Characterized by or acting with rigor: a rigorous program to restore physical fitness.

2. Full of rigors; harsh: a rigorous climate.

3. Rigidly accurate; precise. See Synonyms at burdensome.

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rigor·ous·ly adv.

rigor·ous·ness n.

Thesaurus

Noun	1.	rigorousness - something hard to endure; "the asperity of northern winters" asperity, rigor, rigourousness, severeness, severity, rigour, grimness, hardship difficultness, difficulty - the quality of being difficult; "they agreed about the difficulty of the climb" sternness - the quality (as of scenery) being grim and gloomy and forbidding; "the sternness of his surroundings made him uncomfortable"
	2.	rigorousness - excessive sternness; "severity of character"; "the harshness of his punishment was inhuman"; "the rigors of boot camp" inclemency, rigourousness, rigor, rigour, harshness, severeness, severity, stiffness, hardness sternness, strictness - uncompromising resolution