相关单词同義詞unnecessary, futile, 近義詞 disadvantageous, ineffective, worthless反義詞useful臨近詞user, useful, uselessly, Useless PCB, uselessness, useless land, useless work, uselessmouth, Useless space, useless usage, useless mouth, useless symbol相似詞useful, useful idiot, usefully, usefulness, user, user experience, user group, user-friendly, 返回 useless