| rigor | (noun) something hard to endure | Synonyms: asperity, grimness, hardship, rigorousness, rigour, rigourousness, severeness, severity |
|---|
| (noun) the quality of being valid and rigorous | Synonyms: cogency, rigour, validity |
| (noun) excessive sternness | Synonyms: hardness, harshness, inclemency, rigorousness, rigour, rigourousness, severeness, severity, stiffness |
| vigor | (noun) active strength of body or mind | Synonyms: dynamism, heartiness, vigour |
|---|
| (noun) an imaginative lively style (especially style of writing) | Synonyms: energy, muscularity, vigour, vim |
| (noun) forceful exertion | Synonyms: energy, vigour, zip |