相关单词同义词regression, degradation, deterioration, degeneration, 近义词 uselessness 无用, desuetude 废止, undesirability 不受欢迎, oldness 年老临近词OBS, obsite相似词obsession, obsessive, obsessive-compulsive disorder, obsidian, obsolescent, obsolete, obstacle, obstacle course, 返回 obsolescence