rigorous

1 ENTRIES FOUND:
rigorous /ˈrɪgərəs/ adjective
rigorous
/ˈrɪgərəs/
adjective
Britannica Dictionary definition of RIGOROUS
[more rigorous; most rigorous]
1 
: very strict and demanding
2 
: done carefully and with a lot of attention to detail
3 
: difficult to endure because of extreme conditions

— rigorously

adverb

— rigorousness

noun [noncount]