(adv.) Unfruitfully; unproductively.

apathetically aridly barrenly bleakly bloodlessly burdensomely close closely coldly colorlessly compactly cumbersomely densely dismally dormantly draggily drearily drearisomely dryly dully dustily effetely emptily firmly funereally gloomily gravely grimly heavy hollowly impassively inactively inanely inertly insipidly jejunely languidly languorously latently leadenly lifelessly onerously pallidly passively phlegmatically ploddingly pointlessly ponderously sadly slowly sluggishly solemnly solidly somberly sombrously spiritlessly stagnantly statically stodgily stoically stolidly stuffily superficially tastelessly tediously thick thickly torpidly uninterestingly vapidly weightily