strenuitas

strēnŭĭtas, ātis, f. [strenuus],

nimbleness , briskness , vivacity , activity (very rare; perh. only in the two foll. passages): ab strenuitate et nobilitate strenui et nobiles, Varr. L. L. 8, § 15 Müll.: strenuitas antiqua manet, Ov. M. 9, 320.