No estar en su sano juicio

[ROBINDESBOIS]

It means to be insane, to do crazy things for example to eat grass in a park.
How do we say in English " no estar en su sano juicio?
He is not sane????
He is not mentally healthy???

[pjt33]

He isn't in his right mind.
He isn't compos mentis.

[JPablo]

Yup, I heard too, he is non compos mentis.

What about, he is out of his mind? (Is that more like a temporary state or condition?)

[Perikles]

Yup, I heard too, he is non compos mentis.

What about, he is out of his mind? (Is that more like a temporary state or condition?)"out of his mind" could be a temporary state, like high on drugs. The non compos mentis is a legal expression for a more permanent state.

[Awaken]

He isn't of sound mind.

[JPablo]

Thank you.
If one is not in his right mind, then he is in his left one... right?
Mmm... left.

[poli]

Thank you.
If one is not in his right mind, then he is in his left one... right?
Mmm... left.
:lol:wrong

In some cases you may say: has been declared incompetent.

[JPablo]

Like in my case above... but sorry, I just left...