rig·or (US) or Brit rig·our 
/ˈrɪgɚ/ noun
plural rig·ors /ˈrɪgɚ/ noun 1 rigors [plural] : the difficult and unpleasant conditions or experiences that are associated with something
▪ They underwent the rigors of military training. ▪ the rigors of life in the wilderness 2 [noncount] : the quality or state of being very exact, careful, or strict
▪ They conducted the experiments with scientific rigor. ▪ a scholar known for her intellectual rigor
▪ They underwent the rigors of military training. ▪ the rigors of life in the wilderness
▪ They conducted the experiments with scientific rigor. ▪ a scholar known for her intellectual rigor
