Kindergarten!

[GeneD]

When an adult behaves in a ridiculously childish way (not while "kidding" ; in a serious manner), we in Russian might exclaim "Kindergarten!" or "What a kindergarten!" Are there any similar ways to express the idea in English?

 

[Rover_KE]

'Kindergarten' is the place/building. A child who goes there is a 'kindergartner'.

'Don't be childish!'
'Stop talking like a baby!'
'Act your age!'
'Grow up!'

 

[GeneD]

Thanks for the phrases. Very helpful. :up:
As for the word "kindergarten" as a place, in Russian, together with this meaning, it's also used exactly the way I showed in post 1 - to express the idea of certain behaviour. (Maybe confusingly for English speakers.) There is also the word "circus" used similarly, but I'll better open another thread so as not to drift off-topic.

 

[Tdol]

Babyish

 

[GeneD]

Thanks, Tdol. How would you use "babyish"? A person has babyish behaviour or in some other way?