go soft in the head

To become dumb, foolish, or witless. You sold the car and bought a scooter? Have you gone soft in the head? Tommy's a good kid, but I think he's gone a little soft in the head. You can't tell people you want to start a business selling bees as pets—they'll think you've gone soft in the head!

be/go soft in the ˈhead

(informal, disapproving) be/become crazy or stupid: Sometimes I talk to myself in the street; people must think I’m soft in the head.

See also: go, head, soft

Farlex Partner Idioms Dictionary © Farlex 2017

See also:

where
the great (something) in the sky
be gone on
bit-bucket
gone on (one)
haywire
go haywire
go haywire, to
be gone up
to hell and gone

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