相关单词近义词 inadequately 不够地, hopelessly 绝望地, ineptly 不适当地, pathetically 悲哀地, incompetently 无能力地, inefficiently 无效率地, ineffectually 无效地, in vain 徒然, unsuccessfully 失败地反义词usefully, 有用地临近词useless, useless luxury, useless to try, useless effort, useless current, useless plastic, useless without, useless student, useless arguing, useless quality, Useless learning 返回 uselessly