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.
strēnuitās ātis, f strenuus, briskness, vivacity, activity : antiqua, O. ...
An Elementary Latin Dictionary