Definition of the word rigorous

The word "rigorous" comes from the Latin word "rigor" meaning "frost" or "hardness." This root is also present in words such as "rigid," "rigmarole," and "refrigerate." In the 16th century, "rigorous" began to be used as an adjective to describe things that are extremely thorough, exacting, or demanding. Its usage in this context likely stemmed from the idea that even seemingly small things, when done with enough thoroughness, can have a significant impact like a frozen object has great hardness or rigidity. Over time, "rigorous" came to be associated with mathematical and scientific proofs that are carefully constructed and demanded absolute precision in the use of mathematical principles. Today, the word is used in a variety of contexts to describe actions, processes, or situations that require intense focus, attention to detail, and a strong commitment to achieving the desired outcome, often in the face of difficulty or adversity.