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Alacrity
Alacrity A*lac"ri*ty, n. [L. alacritas, fr. alacer lively,
eager, prob. akin to Gr. ? to drive, Goth. 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. --Shak.
Meaning of Alacrity from wikipedia