periodically

intermittently, recurrently, regularly

commonly, habitually, ordinarily, routinely

always, consistently, continuingly, continuously, night and day, perpetually, steadily, unceasingly, uninterruptedly, unremittingly

again and again, constantly, continually, frequently, hourly, much, oft, often, oftentimes (or ofttimes), over and over, repeatedly

dependably, generally, normally, typically, usually

aye (also ay), ever, forever, incessantly, invariably, unfailingly

here and there, now, now and then, occasionally, sometimes

intermittently, off and on, on and off, recurrently

infrequently, little, rarely, seldom

irregularly, sporadically, variously

at times, ever and anon, every now and then (or every now and again), from time to time, once in a while, on occasion