RIG'OROUS, adjective 1. Severe; allowing no abatement or mitigation; as a rigorous officer of justice. 2. Severe; exact; strict; without abatement or relaxation; as a rigorous execution of law; an enforcement of rigorous discipline. 3. Exact; strict; scrupulously accurate; as a rigorous definition or demonstration. 4. Severe; very cold; as a rigorous winter.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI