penal
词根词缀：
impunity n. 不受惩罚
im 不 + pun 惩罚 + ity 具备某种性质，状况 → 不受惩罚
penal adj. 刑罚的
pen 惩罚 + al …的 → 刑罚的
penalize v. 处罚
penal〔= pen〕惩罚 + ize 使 → 处罚
penalty n. 惩罚
penal 刑罚的 + ty 表情况 → 惩罚
penance n. 赎罪
pen 惩罚 + ance 表状况 → 接受惩罚 → 赎罪
penitent adj. 后悔的
penit〔= pen〕惩罚 + ent 具有…性质的，关于…的 → 因受惩罚而后悔 → 后悔的
punish v. 惩罚
pun 惩罚 + ish 使… → 惩罚
punishment n. 惩罚
punish 惩罚 + ment 表结果 → 惩罚
repent v. 后悔
re 反 + pent〔= pen〕惩罚 → 反过来惩罚自己 → 后悔
数据来源：新东方英语词汇速记大全
相关例句：
The article mainly analyses women's status in Qing Dynasty from the viewpoint of penal law, civil law and lawsuit.
从刑事、民事和诉讼三个主要法律视角分析清法典，藉此考察清代妇女的社会地位。
Environmental Crime was firstly stipulated in Penal Code of our country systematically.
我国刑法典首次对环境犯罪作了系统、体的规定。刑事诉讼法（法典）
In the past, attempts to commit murder were punishable by penal servitude for life.
过去，企图谋杀是可以用终身服劳役处罚的。
In the Qing dynasty, the officials's penal system includes two parts: disciplinary sanction and penal punishment.
清代官吏惩戒制度分为行政处分、罚制裁两大类别。
The restraining criminal law of the value of the Penal Code as one of strict liability is also undoubtedly in China's development is the guiding role.
谦抑性作为刑法的价值之一，无疑也是对严格责任在我国的发展有指导作用的。
Emperor of the Qin Dynasty Han since also made a major reform of the Penal Code.
汉文帝对秦代以来的刑法也作了重大改革。