WordWeb Online

1. Something hard to endure
   "the rigor of northern winters"
   - asperity, grimness, hardship, rigour [Brit, Cdn], severity, severeness, rigorousness, rigourousness [Brit, non-standard]
    
2. The quality of being valid and rigorous
   - cogency, validity, rigour [Brit, Cdn]
    
3. Excessive sternness
   "the rigors of boot camp"
   - severity, severeness, harshness, rigour [Brit, Cdn], rigorousness, rigourousness [Brit, non-standard], inclemency, hardness, stiffness

Sounds like: rigger, rigour

Derived forms: rigors

See also: rigorous

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

Encyclopedia: Rigor