usefully Antonyms

abominably quixotically virulently inadequately haphazardly awkwardly inappropriately erroneously idealistically inadvisedly defectively erringly imprudently unfavourably unsuccessfully poorly mistakenly ineptly badly balefully blunderingly carelessly clumsily crudely faultily foolishly futilely improperly incompetently inconveniently incorrectly ineffectively uselessly