adjective rig·or·ous \ˈri-g(ə-)rəs\

: very strict and demanding

: done carefully and with a lot of attention to detail

: difficult to endure because of extreme conditions

Full Definition of RIGOROUS

:  manifesting, exercising, or favoring rigor :  very strict
a :  marked by extremes of temperature or climate
b :  harsh, severe
:  scrupulously accurate :  precise
rig·or·ous·ly adverb
rig·or·ous·ness noun

Examples of RIGOROUS

  1. rigorous enforcement of the rules
  2. a rigorous course of study
  3. We subjected the data to a rigorous analysis.

First Known Use of RIGOROUS

15th century


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