I’ve heard it all before
Definition 1 of 1
Pro Tip 1/3Skepticism Expressed
Shows you doubt someone's words because you've heard similar things before without results. 
You say you'll clean your room by tomorrow? I've heard it all before.
Pro Tip 2/3Not Convinced
Use it to show you are not persuaded or impressed by what someone is saying. 
The politician made lots of promises, but voters thought, 'I've heard it all before.'
Pro Tip 3/3Frustration Hint
Can indicate you're tired of hearing repetitive statements that don't lead to action. 
When mom heard the excuse again, she sighed, 'I've heard it all before.'