The Collaborative International Dictionary
Firmity
Firmity \Firm"i*ty\, n. [L. firmitas.]
Strength; firmness; stability. [Obs.]
--Chillingworth.
Wiktionary
firmity
n. (context obsolete English) strength; firmness; stability
Usage examples of "firmity".
But I would give all I have to be able to wear such blinkers as he wore, and to have such firmity of purpose.