(adv.) In a variable manner.

at irregular intervals at random back and forth brokenly by catches by fits by jerks by snatches capriciously changeably desultorily disconnectedly discontinuously eccentrically erratically fitfully haltingly in and out in snatches in spots inconstantly intermittently irregularly jerkily lurchingly nonuniformly off and on on and off patchily roughly round and round spasmodically sporadically spottily to and fro uncertainly unevenly unmethodically unpredictably unrhythmically unsteadfastly unsteadily unsystematically waveringly whimsically wobblingly