This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The quality or state of being strenuous.

n. The state or character of being strenuous; strenuousness.

n. A strained effect, or a straining for effect, as in a literary composition.

n. intense energy

"The strenuosity of the life, the nervous excitement alternating with ennui, the lack and improper times of sleep, the lack of rest and particularly of restful occupation, the not infrequent use of alcohol in injurious amounts, are all factors calculated to make a defect operative."

vigor    zip    vigour    energy   

strenuousness