"rigorous" in the adjective sense
1. rigorous, strict
rigidly accurate allowing no deviation from a standard
"rigorous application of the law"
"a strict vegetarian"
2. rigorous, stringent, tight
demanding strict attention to rules and procedures
"rigorous discipline"
"tight security"
"stringent safety measures"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License