How to say in Czech: He is such an unpleasant boy!

English
is such an
Czech
On je tak nesympatický kluk!
He is trying not to be unpleasant.
He is such a brave boy!
Does he know this boy?
What is this boy doing here?
Who is this boy?
Why is this boy here?
Does anybody know this boy?
He is young.
He lives there.
Sorry the place is such a mess...

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