From the ArcaMax Publishing, Vocabulary Newsletter:
http://www.arcamax.com/news/vocabulary/s-362804-697817
sporadic \spuh-RAD-ik\ (adjective) - Occurring singly, or
occasionally, or in scattered instances.
"During my lectures, my pacing could appear sporadic to the students.
If I looked sporadic, I would be perceived as being sporadic." --
Christopher Scott, 'Protege'
Sporadic derives from Medieval Latin sporadicus, scattered, from Greek
sporadikos, from sporas, sporad-, scattered like seed.