Explanation: With confidence, let; orpiment that Jiguanshi, yellow mineral used as pigment. The ancients used yellow writing, wrong, with a female yellow smear rewritten. Parable regardless of the fact, casually talk nonsense. Usage: Contraction type; as predicate, object, attribute; containing derogatory Source: Jin Sun Sheng "Jinyang Autumn" Wang Yan, Yi Fu words, can speak, there is unrest in Italy who, Noir more of, when the number of female yellow mouth. " Examples: Sun Joun-yung at the facts and if not anything, but she embellished the facts, ~, fabricated, doing slander provoke conflict. ★ Feng Deying "Spring Flowers" Chapter XXI
xìn kǒu cí huáng
Ancient writing used yellow, was wrong with the female yellow smear on the rewrite. Parable regardless of the facts, random irresponsible remarks
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No. 3
"Selected Works of Liu Jun <Canton Breaking off of>" "out of his lips to kiss the female yellow, purple by Zhu Dan-month" lead Jin Sun Sheng Li Shan "Jinyang Autumn": "Wang Yen, Yi-fu character, can be words, in Italy there disturbed persons, Zhe more of, when the number of female yellow mouth. "orpiment orange is a mineral that Jiguanshi can be used for pigment. Written in ancient times used yellow, a mistake that is rewritten with a female yellow smear. Later, because despite the fact that free to criticize or make irresponsible remarks as "irresponsible remarks." Nie Gannu "Reading Lu Xun <Filial Piety Figure>": "A lot of things that are invented by the emperor, as the ancients of the ignorance side of course, I do not know those things come from, strong for Jie Shi's irresponsible remarks, one side should be a big deception. "Ba Jin" last moment ":" They nonsense 'old right', 'black guns', 'no war', this is really nonsense, irresponsible remarks. "
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No. 4
〖成语〗： 信口雌黄 〖拼音〗： xìn kǒu cí huáng
〖解释〗：信：任凭，听任；雌黄：即鸡冠石，黄色矿物，用作颜料。古人用黄纸写字，写错了，用雌黄涂抹后改写。比喻不顾事实，随口乱说。
〖出处〗：晋·孙盛《晋阳秋》：“王衍，字夷甫，能言，于意有不安者，辄更易之，时号口中雌黄。”
〖示例〗：如果孙俊英按事实讲也没有什么，但是她添油加醋，～，凭空捏造，极尽诬蔑挑拨之能事。 ★冯德英《迎春花》第二十一章
〖用法〗：作谓语、宾语、定语；指说话随便
〖近义词〗：胡说八道、胡言乱语、信口开河
〖反义词〗：信而有征、言之凿凿、守口如瓶
〖故事〗：晋朝清谈家王衍担任元城县令时很少办公事，经常约人在一起没完没了地闲聊。他最喜欢老子和庄子的玄理，清谈时手里拿着鹿尾拂尘，侃侃而谈，经常前后矛盾，漏洞百出，有人质疑时，他随口更改，随心所欲。人们说他是“口中雌黄”
信口雌黄”在汉英词典中的解释(来源:百度词典)：
to make irresponsible remarks; to wag one's tongue too freely; to utter nonsense
“信口雌黄”这句成语，其意思是有些人不顾事实，随便乱说，信口二字人们容易明白，是随口说话，但为何与一个矿物名字——雌黄联在一起呢?
雌黄是一种矿物，其成分为三硫化二砷，柠檬黄色，多为细粒状、片状或柱块状，也有为肾状者，多为珍珠光泽。在古时人们写字时用的是黄纸，如果把字写错了，用这种矿物涂一涂，就可以重写，所以，成语的源由就出于此。
原于《晋书·王衍传》。王衍是东晋人，有名的清谈家。他喜欢老庄学说，每天谈的多半是老庄玄理。但是往往前后矛盾，漏洞百出，别人指出他的错误或提出质疑，他也满不在乎，甚至不假思索，随口更改。于是当时人说他是“口中雌黄”。《颜氏家训》中也有“观天下书未遍，不得妄下雌黄”之论。这就是这则成语的来源。
n.: make irresponsible remarks, talk sheer nonsense, wag one's tongue too freely
v.: riticize without ground, criticize wildly
Thesaurus
alienate call [make] white black, Abortion law arbitrary discipline, irregularity, slander, deliberately break the law, misconduct, frolic, calm air uprise, talk nonsense, enforce the law commission, Defy the law, violate the law and commit crimes; commit offences against law and discipline, A spring gossip
Antonym
copiously quote the classics, quote copiously from many sources