not right in the head

Mentally unsound, as in Physically, she's quite healthy for ninety, but we suspect she's not right in the head. This usage was first recorded as right in his wits in 1662.

Words nearby not right in the head

not one's day, this is, not oneself, not open one's mouth, not proven, not put something past someone, not right in the head, not see beyond one's nose, not suffer fools gladly, not take no for answer, not the half of it, not the only fish in the sea