rigorousˈrɪg ər əs
rigorous, strict (adj)
rigidly accurate; allowing no deviation from a standard
"rigorous application of the law"; "a strict vegetarian"
rigorous, stringent, tight (adj)
demanding strict attention to rules and procedures
"rigorous discipline"; "tight security"; "stringent safety measures"
Manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration.
Severe; intense; inclement; as, a rigorous winter.