相关单词同義詞regression, degradation, deterioration, degeneration, 近義詞 uselessness 無用, desuetude 廢止, undesirability 不受歡迎, oldness 年老臨近詞OBS, obsite相似詞obsession, obsessive, obsessive-compulsive disorder, obsidian, obsolescent, obsolete, obstacle, obstacle course, 返回 obsolescence