Same word as variably:
alternately, at intervals, at times, every once in a while, every so often, fluctuating, from time to time, irregularly, now and then, occasionally, on occasion, once in a while, sometimes, sporadically, vacillating, variably
alternately, at intervals, at times, every once in a while, every so often, fluctuating, from time to time, irregularly, now and then, occasionally, on occasion, once in a while, sometimes, sporadically, vacillating, variably