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incestuous + noun
incestuous 作定语时，常修饰 relationship、marriage、union 等表示亲属或婚姻关系的名词。
The novel describes an incestuous relationship between siblings.
这部小说描述了兄弟姐妹之间的乱伦关系。
乱伦的；近亲相奸的
先理解核心含义，再看它在真实句子里的用法。
乱伦的；近亲相奸的
relating to or involving incest
The novel describes an incestuous relationship between siblings.
这部小说描述了兄弟姐妹之间的乱伦关系。
与乱伦有关的；犯乱伦罪的。
Pertaining to or engaging in incest.
以亲密排外、损害外人利益的关系为特征的。
Characterized by mutual relationships that are intimate and exclusive to the detriment of outsiders.
The documentary interviewed survivors of incestuous families.
这部纪录片采访了乱伦家庭的幸存者。
Their relationship was incestuous, and they knew it was wrong.
他们的关系是乱伦的，他们知道这是错的。
The novel describes an incestuous love affair that leads to tragedy.
这部小说描写了一段最终导致悲剧的乱伦恋情。
incestuous 作定语时，常修饰 relationship、marriage、union 等表示亲属或婚姻关系的名词。
The novel describes an incestuous relationship between siblings.
这部小说描述了兄弟姐妹之间的乱伦关系。
系动词后作表语时，除字面义“乱伦的”外，多用来比喻关系、团体之间过分紧密。
The relationship between the journalists and the politicians was incestuous.
记者和政客之间的关系过分亲密。
Not this
They have an incest relationship.
Use this
They have an incestuous relationship.
incest 是名词，不能直接作定语修饰名词；表示“乱伦的”应用形容词 incestuous。
Not this
Incestuous is forbidden by law.
Use this
Incest is forbidden by law.
主语位置需要名词；incestuous 是形容词，不能作主语，应改用名词 incest。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
乱伦关系
The therapist asked about the incestuous relationship that had caused her trauma.
治疗师问起了那段给她造成创伤的乱伦关系。
乱伦私情
The newspaper revealed the incestuous affair between the politician and his sister.
报纸揭露了那位政客与其妹妹之间的乱伦私情。
乱伦虐待
The charity provides support for victims of incestuous abuse.
该慈善机构为乱伦虐待的受害者提供支持。
乱伦家庭
In an incestuous family, children often suffer from deep shame and confusion.
在乱伦家庭中，孩子常会深感羞耻和困惑。
乱伦欲望
The novel explores the protagonist's incestuous desire for her twin brother.
小说探讨了主人公对其孪生兄弟的乱伦欲望。
（出自《发展受阻》）那不算乱伦，但却是表亲间的情愫。
The local newspaper described their relationship as incestuous.
当地报纸把他们之间的关系称为乱伦。
（出自莎士比亚《哈姆雷特》）哦，多么罪恶的匆忙，竟如此灵巧地奔向乱伦的床笫！
The novel's plot revolves around an incestuous royal family.
这部小说的情节围绕一个乱伦的王室家族展开。
Use incestuous naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 incestuous 拆成 incest（乱伦）+ uous（形容词尾）：一家人挤在同一窝里，亲密得越界。
语域：formal 常见场景：法律/司法文书、心理学/临床报告、新闻评论、政商分析 incestuous 通常用于正式、书面语。本义「乱伦的/近亲相奸的」多出现在法律或临床语境；比喻义「过分亲密的/小圈子的」则常见于新闻报道和政商评论，但同样属于书面表达。
No common word truly rhymes with incestuous /ɪnˈsestjuəs/ because its stressed syllable is /ˈsest/. The words below are useful lookalikes: they share the -uous spelling and a final unstressed /juəs/ (e.g., continuous /kənˈtɪnjuəs/, conspicuous /kənˈspɪkjuəs/), but their stress falls earlier. Be careful with arduous /ˈɑːdjuəs/ (or /ˈɑːrdʒuəs/) and superfluous /suːˈpɜːrfluəs/, where the ending is not exactly /tjuəs/.
Dictionary facts from ECDICT, WIKTIONARY.