【Vigorous】 , 【energetic】 , 【strenuous】 , 【lusty】 , 【nervous】 can all mean having or manifesting great vitality and force.
A person or thing is 【vigorous】 that has or manifests active strength or force and exhibits no signs of a depletion of the powers associated with freshness or robustness of body or mind.
A person or thing is 【energetic】 that displays abundant force or a capacity for great activity; the term does not necessarily connote the reserve vitality and force that 【vigorous】 implies and it sometimes even suggests an exertion of effort or a bustling activity that has little to do with inherent physical or mental strength; therefore the term may be used to suggest compliment or, less often, slight depreciation.
A person that is 【strenuous】 is continuously and zealously 【energetic】 , while a thing that is 【strenuous】 makes constant demands on one's vigor, energy, and zeal; in both cases the term implies no flagging of ardor or no avoidance of the arduous.
A person or thing is 【lusty】 that exhibits exuberant vigor or energy.
A thing (as a quality, a style, or an utterance) is 【nervous】 that conveys a feeling of continuing often forceful activity such as results from mental vigor and energy.
