not right in the head

not right in the head idiom
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.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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