What's the difference between 'fed up' and 'sick of'
I'm fed up with his excuses.
I'm sick of his excuses.

They sound like having the same meaning. Are they interchangeable?

Question

What's the difference between 'fed up' and 'sick of'
I'm fed up with his excuses.
I'm sick of his excuses.

They sound like having the same meaning. Are they interchangeable?

Answer

The difference is barely noticeable.

Being fed up with something might mean that you are bored of it;
Being sick of something is pretty much the same but with a little more emphasis. It really does depend on the context though!

Answer

fed up is probably understood to mean bored with.
sick of is probably more used to mean disgusted with. 
they are both often used interchangeably​.

Answer

no real difference. I am sure some people will find a subtle difference. That is what happens in languages, especially English.

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