spasmodically
adverb /spæzˈmɒdɪkli/
  /spæzˈmɑːdɪkli/
- suddenly for short periods of time; not regularly or continuously
- Her involvement with the organization continued spasmodically for fifteen years.
 
 - (specialist) in a way that is caused by your muscles becoming tight in a way that you cannot control
- His hand jerked spasmodically.