as ugly as sin
非常丑陋，极其难看
口语·夸张·形容非常难看
英文释义
extremely unattractive
例句
That old building is as ugly as sin, but they plan to renovate it.
典故来源
源自基督教文化中“罪”被视为丑陋邪恶的象征，用其极端负面形象形容外貌丑陋。