infrequency
once in a blue moon
nonfrequent
seldom
episodicity
at times
unexpedited
occasionally
from time to time
now and again
once in a while
infrequently
on occasion
choppy
now and then
infrequent
bodacious
fadeout
receding
off and on
on and off
frequent
unoccasional
noncontinuable
impersistent
rarely
small
I can't remember the last time
unresumable
unconsequential
nonapertured
unfrequent
sporadicalness
intermissive
unapertured
unoften
sporadical
inopportune
underenthused
discontinuously
inconsequentness
inert
noninterim
seldomness
nonappealing
go narrow
soggy
noniterated
unassimilable
torpid