unprecedential
nonprecedential
untimely
I can't remember the last time
unusual
nonintermittent
nonconsecutive
noninstantaneous
nonconstant
unrecurrent
nonrecurrent
unattended
unintermittent
patchy
not at all
to a lesser extent
unfretful
nongradual
unpreferentially
nonpreferentially
unregular
never
as often as not
unanticipative
unslighted
nonapertured
uncontinuous
noninterim
not yet
unapertured
unoccasioned
sporadically
nondaily
unfellowly
unpredicable
nonresumptive
sometimes
discontinuously
periodically
on average
least of all
unvehement
nonlong
nonperennial