■ adjective
1》 extremely thorough, exhaustive, or accurate.
2》 (of a rule, system, etc.) strictly applied or adhered to.
↘adhering strictly to a belief or system.
3》 harsh and demanding.
Derivatives
~ly adverb
~ness noun
Origin
ME: from OFr. ~ or late L. rigorosus , from rigor (see rigor 1 ).