(1):
(a.) Manifesting, exercising, or favoring rigor; 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.
(2):
(a.) Severe; intense; inclement; as, a rigorous winter.
(3):
(a.) Violent.