1. The quality of being valid and rigorous
   "The rigor of the experiment impressed the scientific community";
   - cogency, validity, rigour [Brit, Cdn]
    
2. The quality of being hard to endure, uninviting or formidable
   "the rigor of northern winters";
   - asperity, grimness, hardship, rigour [Brit, Cdn], severity, severeness [rare], rigorousness
    
3. Excessive or stern strictness in attitude, judgment, or treatment
   "the rigors of boot camp";
   - severity, severeness [rare], harshness, rigour [Brit, Cdn], rigorousness, inclemency [archaic], stiffness

Sounds like: rigor

Derived forms: rigors

Type of: believability, credibility, credibleness, difficultness, difficulty, sternness, strictness

Encyclopedia: Rigor