Alacrity
Alacrity ({not transcribed}) , noun
[Latin alacritas, from alacer lively, eager, prob. akin to Greek {not transcribed} to drive, Gothic aljan zeal.]
A cheerful readiness, willingness, or promptitude; joyous activity; briskness; sprightliness; as, the soldiers advanced with alacrity to meet the enemy.
I have not that alacrity of spirit,
Nor cheer of mind that I was wont to have.