be not all there

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be not all there

1. To not be mentally sound; to be crazy or mentally deranged. A: "Look at that guy talking to himself on the corner." B: "I reckon he's not all there."
2. To not be very bright or intelligent; to be dimwitted. Jim's a nice guy, but with some of the foolish things he does, I think he's not all there.
See also: all, not, there

not all there

Fig. not mentally adequate; crazy or silly. Sometimes I think you're not all there. Be nice to Sally. She's not all there.
See also: all, not, there

not all there

not in full possession of your mental faculties. informal
See also: all, not, there

be not all/quite ˈthere

(informal) think slowly because of low intelligence, illness, drugs, etc: Are you sure he’s all there? OPPOSITE: all there
See also: all, not, quite, there

not all there

mod. crazy; stupid acting. You can’t depend on Paul for much help. He’s really not all there.
See also: all, not, there