Synonyms and related words :
aimlessly, aridly, barrenly, bloodlessly, bootlessly, colorlessly, dismally, draggily, drearily, drearisomely, dryly, dully, dustily, effetely, emptily, fecklessly, fruitlessly, futilely, heavily, hollowly, inanely, insipidly, jejunely, lifelessly, needlessly, pallidly, ploddingly, ponderously, purposelessly, slowly, spiritlessly, stodgily, stuffily, superficially, tastelessly, tediously, to little purpose, to no purpose, uninterestingly, unnecessarily, uselessly, vainly, vapidly