vigor in WordNet English dictionary

1. active strength of body or mind
   vigor  vigour  dynamism  heartiness 
   
2. forceful exertion
   "he plays tennis with great energy"; "he's full of zip"
   energy  vigor  vigour  zip 
   
3. an imaginative lively style (especially style of writing)
   "his writing conveys great energy"; "a remarkable muscularity of style"
   energy  muscularity  vigor  vigour  vim