rigors:
1 a (1): harsh inflexibility in opinion, temper, or judgment : severity (2): the quality of being unyielding or inflexible : strictness (3): severity of life : austerity b: an act or instance of strictness, severity, or cruelty
2: a tremor caused by a chill
3: a condition that makes life difficult, challenging, or uncomfortable; especially : extremity of cold
4: strict precision : exactness <logical rigor>
5 aobsolete : rigidity, stiffness b: rigidness or torpor of organs or tissue that prevents response to stimuli c: rigor mortis