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

English
That was stupid of
Czech
To bylo od nich 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 you understand them?
That was not very polite of them.
That was very impolite of them.
That was very kind of them.
That is very kind of them.

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