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The Collaborative International Dictionary
Sprightfulness

Sprightful \Spright"ful\ (-f[usd]l), a. [Spright sprite + full.] Full of spirit or of life; spirited; earnest; vivacious; lively; brisk; nimble; gay. [Obs.] -- Spright"ful*ly, adv. [Obs.]
--Shak.

Spoke like a sprightful noble gentleman.
--Shak.

Steeds sprightful as the light.
--Cowley.

Wiktionary
sprightfulness

n. (context rare English) The quality of being sprightful