<p>空口无凭，言而无据，无根之论</p>

<p>But you can coin four-character words to express it more accurately. It looks like that you mean academic claims.</p>

<p>Let me have a try:</p>

<p>论訇证寡（The claim is thunderous(figurative), but the evidence is little.）</p>

<p>例句：</p>

<p>像他这样的学术投机分子，才敢在会上作论訇证寡的报告。</p>

<p>Note: Only in writing you can coin such words. Otherwise people won't understand you.</p>

CC BY-SA 4.0
2019-11-19T10:54:25.557Z
2019-11-19T10:54:25.557Z
Toosky Hierot
<p>Not sure If 言过其实 can fit. it means <em>a statement surpassing the fact</em>. </p>

<p>or 夸大其词？ it means <em>represent beyond the bounds of truth; make an overstatement;</em></p>

CC BY-SA 4.0
2019-11-19T08:47:40.910Z
2019-11-19T08:47:40.910Z
dan
<p>In addition to some good answers:</p>

<p>信口开河</p>

<p>夸夸其谈</p>

CC BY-SA 4.0
2019-11-19T18:05:26.983Z
2019-11-19T18:05:26.983Z
sylvia
<p>This thread would never be complete without the "urban-dictionary" style (i.e, slang), modern example for such idiom, the good old <strong><code>吹牛</code></strong>, or its R-rated version <strong><code>吹牛逼</code></strong>. </p>

<p>It generally means to brag about something, which <em>could</em> be true but usually isn't. </p>

CC BY-SA 4.0
2019-11-19T11:02:05.237Z
2019-11-19T11:02:05.237Z
Yoav Vollansky
<p>Is there an idiom that means to make big claims but have little evidence to support them?</p>

CC BY-SA 4.0
2019-11-19T08:09:05.520Z
Maybe [穿凿附会](https://baike.baidu.com/item/%E7%A9%BF%E5%87%BF%E9%99%84%E4%BC%9A) ([YouDao](https://youdao.com/w/穿凿附会)), but I'm not sure.
Becky 李蓓
CC BY-SA 4.0
2019-11-19T08:14:07.810Z
[信口雌黄](https://youdao.com/w/%E4%BF%A1%E5%8F%A3%E9%9B%8C%E9%BB%84), [捕风捉影](https://youdao.com/w/%E6%8D%95%E9%A3%8E%E6%8D%89%E5%BD%B1).
xenophōn
CC BY-SA 4.0
2019-11-19T11:18:37.327Z
Do you mean "make big claims" about one's own situation, or "make big claims" like conspiracy theories?
dROOOze
<phrase><idioms>
Is there an idiom that means to make big claims but have little evidence to support them?
# Is there an idiom that means to make big claims but have little evidence to support them?

(Asked by: username_0 on 2019-11-19)

Is there an idiom that means to make big claims but have little evidence to support them?

**Tags:** phrase, idioms
> **Comments:**
> **username_1**: Maybe [穿凿附会](https://baike.baidu.com/item/%E7%A9%BF%E5%87%BF%E9%99%84%E4%BC%9A) ([YouDao](https://youdao.com/w/穿凿附会)), but I'm not sure.  
> **username_2**: [信口雌黄](https://youdao.com/w/%E4%BF%A1%E5%8F%A3%E9%9B%8C%E9%BB%84), [捕风捉影](https://youdao.com/w/%E6%8D%95%E9%A3%8E%E6%8D%89%E5%BD%B1).  
> **username_3**: Do you mean "make big claims" about one's own situation, or "make big claims" like conspiracy theories?  

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## 4 answers

### Answer by username_4 on 2019-11-19. Score: 1 | Accepted answer

空口无凭，言而无据，无根之论

But you can coin four-character words to express it more accurately. It looks like that you mean academic claims.

Let me have a try:

论訇证寡（The claim is thunderous(figurative), but the evidence is little.）

例句：

像他这样的学术投机分子，才敢在会上作论訇证寡的报告。

Note: Only in writing you can coin such words. Otherwise people won't understand you.


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### Answer by username_5 on 2019-11-19. Score: 1

Not sure If 言过其实 can fit. it means *a statement surpassing the fact*.

or 夸大其词？ it means *represent beyond the bounds of truth; make an overstatement;*


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### Answer by username_6 on 2019-11-19. Score: 1

In addition to some good answers:

信口开河

夸夸其谈


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### Answer by username_7 on 2019-11-19. Score: 1

This thread would never be complete without the "urban-dictionary" style (i.e, slang), modern example for such idiom, the good old **`吹牛`**, or its R-rated version **`吹牛逼`**.

It generally means to brag about something, which *could* be true but usually isn't.


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