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To be, or to become crazy or stupid - thesaurus

Synonyms

be/go out of your mind

to be/become crazy or confused

lose the plot

to start behaving in a strange or silly way

take leave of your senses

to start behaving in a way that is not sensible or reasonable

go mad

to become crazy because you are so bored, upset etc

go nuts

informal to behave in a crazy, enthusiastic, or violent way

have a screw loose

to be slightly crazy

be going soft (in the head)

to be becoming silly or slightly crazy

need your head examined

to seem to be crazy or to be doing stupid things

be/go round the bend

to become crazy

be off your head

to be crazy

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More synonyms

be/live in La La Land

mainly American to be silly or unreasonable

be off your rocker

to be crazy

go loopy

informal to become crazy

go nuts

informal to become crazy

lose it

to suddenly become unable to behave or think in a sensible way

lose your marbles

to become crazy

lose your mind

to become crazy or very confused

not know your arse from your elbow

Britishimpolite to be very stupid

spit the dummy

to behave in a childish or unreasonable manner

stretch

verb

to no longer be reasonable

take the biscuit

to be the most silly, stupid, or annoying thing in a series of things

trip out

to start behaving in a silly or uncontrolled way, often because you are frightened or worried

BuzzWord

gaslight

to manipulate someone psychologically so that they begin to question their own perceptions and memories

BuzzWord Article

Open Dictionary

Dunning-Kruger effect

the phenomenon by which an incompetent person is too incompetent to understand his own incompetence

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