soft in the head

1. Mentally deficient; also, silly, foolish. For example, He's nice enough but a bit soft in the head. The soft in this idiom, first recorded in 1775, alludes to a weakness in mental capacity.

Example Sentences

Now don’t go all weak at the knees and soft in the head when you read this:

Read more on Los Angeles Times

Bouloukos is a secret weapon of independent cinema; he was on my best-of list for 2013, for his supporting role in Nathan Silver’s feature “Soft in the Head,” in which he played a group-home resident who dominates the facility’s atmosphere with his smoldering silence and explosive rage.

Read more on The New Yorker

The pregnant girls marked their babies or didn’t, but the grandfathers—unwarned—went soft in the head, walked out of the syrup house, left their beds in the shank of the night, wet themselves, forgot the names of their grown children and where they’d put their razor strops.

Read more on Literature

"I think you've got to be a bit soft in the head with their policies," he claimed.

Read more on BBC

At this point, despite lingering on for a few more years, Mr Blobby became a widely despised irritant, described by no less than the New York Times as “a metaphor for a nation gone soft in the head”.

Read more on The Guardian