Source : WordNet®

vigour
     n 1: an exertion of force; "he plays tennis with great energy"
          [syn: {energy}, {vigor}]
     2: active strength of body or mind [syn: {vigor}]
     3: an imaginative lively style (especially style of writing);
        "his writing conveys great energy" [syn: {energy}, {vigor},
         {vim}]