言而無信的英文：
[Literal Meaning]
words/aux./not/credit
to make a vain promise

[解釋]
說話不算數(shù)，沒有信用。

[Explanation]
to fail to keep faith

[例子]
你既然說過你要在八月底前寫完報(bào)告，就不能言而無信。

[Example]
Since you have said you will complete the report before the end of the end of August, you cannot make a vain promise.

[英文等價(jià)詞]
fail to keep faith
to go back on one's word
Breach of Promise.
to break one's word

參考例句：
  • Don't break your word if you want help.
    如果你要人幫助你，就不可言而無信。

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