How to say in Czech: That was stupid of him.

English
That was stupid of
Czech
To bylo od něj hloupé.
I am trying not to be stupid.
You are such a stupid boy!
Do not do anything stupid!
I find this whole discussion really stupid.
That’s a stupid question.
Do they understand him?
That was not very polite of him.
That was very impolite of him.
That was very kind of him.
That is very kind of him.

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