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