sporadic
Cross references:
1. infrequent
spo.rad.ic \sp*-'rad-ik\ \-i-k(*-)le-\ aj [ML sporadicus, fr. Gk
sporadikos, fr. sporade-n here and]there, fr. sporad-, sporas scattered;
akin to Gk speirein to sow : occurring occasionally, singly, or in
scattered instances : SEPARA TE, ISOLATED {~ case of disease} -
spo.rad.i.cal.ly av
Webster's English Dictionary