Synonyms and related words :
alternately, at irregular intervals, at random, back and forth, backward and forward, backwards and forwards, brokenly, by catches, by fits, by jerks, by snatches, by turns, capriciously, changeably, desultorily, disconnectedly, discontinuously, eccentrically, erratically, every other, fitfully, haltingly, hitch and hike, in and out, in rotation, in snatches, in spots, in turns, inconstantly, intermittently, irregularly, jerkily, lurchingly, make and break, nonuniformly, on and off, patchily, reciprocally, ride and tie, roughly, round and round, seesaw, shuttlewise, spasmodically, sporadically, spottily, to and fro, turn about, uncertainly, unevenly, unmethodically, unpredictably, unrhythmically, unsteadfastly, unsteadily, unsystematically, up and down, variably, waveringly, whimsically, wobblingly