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Ways of saying someone is stupid or silly

grow up

used for telling someone to stop being silly and behaving like a child

don’t encourage someone

used for telling other people that you think that someone is being silly

what is he/she playing at?

used when you think that someone is behaving in a stupid or dishonest way

act/be your age

used for telling someone that they are behaving in a stupid way, as if they were much younger than they really are

someone must be mad (to do something)

used for saying that someone is doing something very stupid, or has done something very stupid

be serious

used for telling someone that you think what they are saying is not sensible

do me/us a favour

used for showing that you think that someone has said or done something silly or annoying

get real

used for telling someone to start considering something in a sensible way and stop being silly or unreasonable about it

(the) more fool you/him/her etc

used for saying that you think someone is doing something stupid

if you believe that, you’ll believe anything

used for telling someone that they are stupid to believe something

hostile architecture

the design of buildings or public spaces in a way which discourages people from touching, climbing or sitting on them …

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boots on the ground

a situation in which a country's armed forces are physically present in an area of conflict …

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