rig ‧ our BrE AmE British English , rigor American English /ˈrɪɡə $ -ər/ noun
1 . the rigours of something the problems and difficulties of a situation:
all the rigors of a Canadian winter
the stresses and rigours of modern life
2 . [uncountable] great care and thoroughness in making sure that something is correct:
Their research seems to me to be lacking in rigour.