Question

فقط حرف میزنه عمل در کار نیست

Answer 1

all talk and no action

e.g. He never gets his job done. He's just all talk and no action.

Answer 2

He is a man of talking, but no walking. He does not walk the talk.

Comments

He talks the talk, but he doesn't walk the walk.

http://dictionary.cambridge.org/dictionary/british/talk-the-talk-walk-the-walk

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Nice +1

Answer 3

He/She is full of hot air. He/She is full of s***.

Answer 4

To pay lip service!

Answer 5

He is all hats and no cattle or all mouth no trousers or all shot, no powder or all sizzle, no steak

Answer 6

also:

He is not true to his word.

He is not as good as his word.

Answer 7

I'm afraid he's more of a talker than a doer, which is why he never finishes anything.

Comments

It works.+1

Answer 8

action speak louder than words.

Answer 9

Lots of talk but no action by him./He make lots of commitments but no proceeding!

Answer 10

blabbing

blabbing	28 up, 16 down
	Some who is rambling or spueing (verbally) nonsense. And Bill just wouldn't shutup, he kept blabbing and blabbing on about his muscle cars.   http://www.urbandictionary.com/define.php?term=blabbing