Vigor
Vigor (noun) /ˈvɪg.əʳ/ US /-ɚ/
great mental or physical strength, vitality, energy, robustness, potency, force, intensity
After his recovery, he resumed his job with renewed vigor.
Antonyms: lethargy, feebleness, weakness
Adjective: vigorous
Adverb: vigorously
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