Intermittently stopping and starting
(Adjective)
Not regularly
Synonyms:
  1. on-and-off
  2. alternately
  3. at irregular intervals
  4. fluctuating
  5. hardly
  6. infrequently
  7. intermittent
  8. irregularly
  9. not often
  10. scarcely
  11. sometimes
  12. sporadically
  13. vacillating
  14. variable
  15. very seldom
  16. when the mood strikes