RhymeZone: rigourous definitions

Definitions of rigourous:

adjective: Misspelling of rigorous. [Showing, causing, or favoring rigour/rigor; scrupulously accurate or strict; thorough.]
adjective: (rare, archaic) Alternative form of rigorous [Showing, causing, or favoring rigour/rigor; scrupulously accurate or strict; thorough.]

(Definitions from Wiktionary)