See our discussion of “Hotfoot and Lightfooted“.

I originally listed this word at “lightfoot”, imagining that “lightfooted” derived from it, but no, “light-footed” has its own OED entry which speaks of the lack of heaviness of the foot in question.  It is spelled in the OED examples with a space, a hyphen, or no space between the “light” and “foot” elements.

  Having a light foot; treading lightly, active, nimble.

• 14.042 Still elves are lightfooted,

“lightfoot, adj.” OED Online. Oxford University Press, December 2015. Web. 18 February 2016.

“light-footed, adj.” OED Online. Oxford University Press, December 2015. Web. 18 February 2016.