out of one's mind
idiomatic phrase
variants
or less commonly out of one's skull
or out of one's gourd
or out of one's tree
: mentally unsound
—usually used informally in an exaggerated way
You can't climb up there! Are you out of your mind?
He was bored out of his mind/skull/gourd/tree.
I feel like I'm going out of my mind.
That noise is driving me out of my mind! [=that noise is bothering me very much]
I was out of my mind with worry. = I was going out of my mind with worry [=I was extremely worried]
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Merriam-Webster unabridged
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