Not a spark of decency
形容某人完全没有礼貌或道德感，行为极其粗鲁。
用于批评他人行为恶劣或缺乏教养。
英文释义
No manners.
例句
He lied to his friend without remorse; there's not a spark of decency in him.
典故来源
'spark'指微小痕迹，'decency'指得体行为，组合强调彻底缺乏基本礼仪。