vigor

vig·or  (vgr)

n.

1. Physical or mental strength, energy, or force.

2. The capacity for natural growth and survival, as of plants or animals.

3. Strong feeling; enthusiasm or intensity.

4. Legal effectiveness or validity.

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[Middle English, from Old French, from Latin, from vigre, to be lively; see weg- in Indo-European roots.]

Synonyms: vigor, dash¹, punch², verve, vim, vitality
These nouns denote a quality of spirited force or energy: intellectual vigor; played the piano with dash; an editorial with real punch; painted with verve; arguing with his usual vim; a decreased mental vitality.

Thesaurus

Noun	1.	vigor - forceful exertion; "he plays tennis with great energy"; "he's full of zip" vigour, energy, zip forcefulness, strength, force - physical energy or intensity; "he hit with all the force he could muster"; "it was destroyed by the strength of the gale"; "a government has not the vitality and forcefulness of a living man" athleticism, strenuosity - intense energy; "his music is characterized by a happy athleticism"
	2.	vigor - active strength of body or mind       heartiness, vigour, dynamism strength - the property of being physically or mentally strong; "fatigue sapped his strength"
	3.	vigor - an imaginative lively style (especially style of writing); "his writing conveys great energy"; "a remarkable muscularity of style" vim, muscularity, vigour, energy sprightliness, liveliness, spirit, life - animation and energy in action or expression; "it was a heavy play and the actors tried in vain to give life to it" verve, vitality - an energetic style