spo ‧ rad ‧ ic /spəˈrædɪk/ BrE AmE adjective
[ Date: 1600-1700 ; Language: Medieval Latin ; Origin: sporadicus , from Greek , from sporaden 'scattered in different places' ]
happening fairly often, but not regularly SYN intermittent :
There has been sporadic violence downtown.
—sporadically /-kli/ adverb :
The fighting continued sporadically for several days.