swingy

adjective6

1. •
   (informal) Having a swinging motion.

   • Which is not to say that a long rope of pearls is the obvious solution—too long and too swingy and you risk looking like you're on your way to a costume party dressed as a flapper. — 2011
2. •
   Inconsistent in performance.
3. •
   Variable in mood; liable to having mood swings.
4. •
   (informal) Characteristic of swing music.

   • Fly has a swingy rhythm and some swell guitar work in its instrumental interludes. — 1942
5. •
   (informal) Having many swing voters.

   • […] redrawing the congressional maps to add at least slightly more Republican votes to the potentially swingy districts of freshmen […] — 2013
6. •
   Allowing stones to curl more than usual.