Sprightly is a related term of light-hearted.
As adjectives the difference between sprightly and light-hearted
is that sprightly
is animated, vivacious or gay; lively while light-hearted
As an adverb sprightly
is in a lively and vigorous way.
Other Comparisons: What's the difference?
animated, vivacious or gay; lively
full of life and vigor, especially with a light and springy step
(especially of old people) energetic and in good health
In a lively and vigorous way