soft in the head

idiomatic phrase

informal + old-fashioned

: foolish, stupid

Have you gone soft in the head?

Given a new study by the National Transportation Safety Board, state lawmakers would have to be soft in the head not to repeal the 2003 law that eliminated the mandatory use of motorcycle helmets.

—The Daily Review & Sunday Review (Towanda, Pennsylvania)

Word History

First Known Use

1834, in the meaning defined above