口だけの男

彼は口だけで行動しない。

---

He's all talk (and/but no action).


「口だけ」「口ばっかり」は be all talk。

be all talk (and/but no action) = SPOKEN to always be talking about what you have done or what you are going to do without ever actually doing anything


例文：

○ Don't pay any attention to her --- she's all talk.


↓記憶を定着させるために考えた文↓

I don't want to be all talk and no action.

I don't want to be a man of all talk and no action.

People who are all talk and no action are a turn-off to me.

I find people who are all talk and no action a real trun-off.

Actions speak louder than words.

I want to be a man of action.
（行動力のある人）

Now is the time for action.
（今こそ行動する時）

It's important to put your idea into action.
（考えを行動に移す）

You must act now.
（今行動しなくちゃ）