1. (a.) Exact; strict; severe; relentless; uncompromising; manifesting, exercising, or favoring rigor; allowing no abatement or mitigation; scrupulously accurate; 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.