(adv.) In a shuddering manner.

at haphazard at intervals at irregular intervals at random brokenly by catches by chance by fits by jerks by skips by snatches capriciously carelessly desultorily disconnectedly discontinuously eccentrically erratically flutteringly haltingly haphazardly here and there hit or miss in snatches in spots inconstantly indiscriminately infrequently intermittently irregularly jerkily lurchingly nonuniformly occasionally off and on patchily per saltum promiscuously quakingly quaveringly quiveringly randomly roughly saltatorily shakily shudderingly skippingly sloppily spasmodically sporadically spottily tremblingly tremulously uncertainly unevenly unmethodically unpredictably unrhythmically unsteadily unsystematically variably waveringly whimsically willy-nilly wobblingly