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Definition of vigor : 1. Active strength or force of body or mind; capacity for exertion, physically, intellectually, or morally; force; energy.
2. Strength or force in animal or force in animal or vegetable nature or action; as, a plant grows with vigor.
3. Strength; efficacy; potency.
4. To invigorate.

Synonyms:

pizzaz, null, cypher, violence, esprit, slide fastener, nada, urgency, oomph, dash, starch, intensity, heartiness, virility, aught, naught, zippo, cipher, postal code, bounce, muscularity, manliness, pertness, sinew, free energy, sparkle, ginger, zip fastener, zipper, nix, push, pizzazz, tired, punch, brawniness, peppiness, brio, vivaciousness, zero, wholeheartedness, vigour, dynamism, zilch, nil, nothing, get-up-and-go, goose egg, vigorousness, life, LAN, impotence, heftiness, weakness, postcode

pep, strength, spirit, power, activity, spunk, snap, potency, fire, fervor, zeal, vim, stamina, zip, effervescence, force, puissance, might, verve, zing, vivacity, energy, drive, spark

haleness, well-being, disease, hardiness, health, feebleness, wholesomeness, fitness, soundness, robustness, salubriousness, endurance

motion, action, raciness, nimbleness, quickness, slowness, alertness, exercise, sluggishness

competence, command, control, grasp, mastery, authority

enthusiasm, friskiness, agitation, lustiness, passion, gusto, earnestness, fervency, sprightliness, animation, excitement, industriousness, relish, eagerness, liveliness, zest, ardency, agility, exuberance

huskiness, stoutness, brawn, vitality, stability, firmness, clout, toughness, muscle, sturdiness

Usage examples:

• " None whatever, except that the search for the Gray Phantom has been renewed with increased vigor. - "The Gray Phantom's Return", Herman Landon.
• The theory of those who hold that woman will yet be man's full equal in physical vigor necessarily implies, as you suggest, that she must probably once have been his actual equal, and calls for an explanation of the loss of that equality. - "Equality", Edward Bellamy.
• It is that which makes a man come back with new vigor to his work after his first failure. - "Humanly Speaking", Samuel McChord Crothers.