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.
- Characterized by or acting with rigor: a rigorous program to restore physical fitness.
- Full of rigors; harsh: a rigorous climate.
- Rigidly accurate; precise. See Synonyms at burdensome.