Waste your breath

Meaning: Speak uselessly, to no purpose. If you waste ​your ​breath, you ​spend ​time and ​energy ​trying to give ​advice that is ​ignored.

Example: Honestly, you're ​wasting ​your ​breath - he doesn't ​want to ​hear what anyone ​else has got to say. Don’t waste your breath trying to make him do it, he won’t change his mind.

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