aperiodic
quasicycle
quasiperiodic
on an irregular basis
periodically
occasional
rarely
oligorecurrence
on a regular basis
occasionally
recurrence
return
asynchronous
pseudoperiodic
periodicity
semiperiodic
periodical
episodic
unperiodic
flash in the pan
-iad
nonperiodic
infrequent
positive recurrent
punctual
recurringly
isochronal
here and there
cyclically
ever
reperiodize
inconstant
antipersistent
unpredictable
unruleful
irregular
quantum
unfrequent
receding
on-again, off-again
accidental
patchy
slow
fadeout
unregular
intermittency
on and off
off and on
stated
erratically
now and again
right away
period
sporadic
irregularize
on occasion
promptly
unoccasional
once in a while
from time to time
now and then
at times
periodic
heterochronic
uncommonly
walkabout
instantaneous
nonrecurrence
roughly
infrequently
frequent
nongradual
broken
fluctuate
seldom
casual
non sequitur
come out of the woodwork
nonfrequent
by fits and starts
opportunity seldom knocks twice
uneven
unregularity
regular
flurry
irregularity
aperiodic
quasiperiodic
occasional
asynchronous
pseudoperiodic
semiperiodic
periodical
episodic
unperiodic
nonperiodic
infrequent
positive recurrent
punctual
isochronal
ever
inconstant
antipersistent
unpredictable
unruleful
irregular
quantum
unfrequent
on-again, off-again
accidental
patchy
slow
unregular
stated
sporadic
unoccasional
periodic
heterochronic
instantaneous
frequent
nongradual
broken
casual
nonfrequent
uneven
regular
periodically
rarely
occasionally
recurringly
here and there
cyclically
on and off
off and on
erratically
now and again
right away
on occasion
promptly
once in a while
from time to time
now and then
at times
uncommonly
roughly
infrequently
seldom
by fits and starts
quasicycle
oligorecurrence
recurrence
return
periodicity
flash in the pan
receding
fadeout
intermittency
period
walkabout
nonrecurrence
non sequitur
unregularity
flurry
irregularity
reperiodize
irregularize
fluctuate
come out of the woodwork
English words for 'for which any return to it may occur at irregular times; not periodic.'
As you may have noticed, above you will find words for "for which any return to it may occur at irregular times; not periodic.". Hover the mouse over the word you'd like to know more about to view its definition. Click 
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